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<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>my work</title> <meta charset="utf-8"> <meta name="description" content="The website of the cryptographer Sofía Celi."> <meta name="author" content="Sofía Celi"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="keywords" content="Cryptography, Programming'"> <meta property="og:title" content="Sofía Celi - cryptographer" /> <meta property="og:type" content="website" /> <meta property="og:url" content="https://sofiaceli.com/" /> <meta name="twitter:site" content="@claucece" /> <meta name="twitter:creator" content="@claucece" /> <meta property="og:url" content="https://sofiaceli.com/" /> <meta property="og:title" content="Sofía Celi's, a cryptographer, website" /> <meta property="og:description" content="Sofía Celi - Cryptography" /> <meta name="theme-color" content="#F97625" /> <link rel='shortcut icon' type='image/x-icon' href="/images/favicon.ico" /> <link rel='shortcut icon' type='image/x-icon' href="/images/favicon_32.ico" /> <link rel="stylesheet" href="/css/main.css"> <link rel="canonical" href="http://claucece.github.io//work/"> <link type="application/atom+xml" rel="alternate" href="http://claucece.github.io//feed.xml" title="Sofía Celi - cryptographer" />  </head> <body> <header class="site-header"> <div class="wrapper"> <a class="site-title" href="/" title="Home"> <img src="/images/home.svg" class="home-logo" alt="Home logo"> </a> <div class="menu"> <a class="menu-link" href="/about/" >about</a> <a class="menu-link" href="/blog/" >blog</a> <a class="menu-link" href="/contact/" >contact</a> <a class="menu-link" href="/cv/" >cv</a> <a class="menu-link" href="/work/" >my work</a> </div> <div class="division"> <div> </div> </header> <div class="home-content"> <div class="wrapper"> <div class="post"> <header class="page-header"> <h1 class="page-title">my work</h1> </header> <article class="page-content"> <div class="container"> <div class="contact-container"> </div> <div class="contact-box"> <h1 class="about-subtitle">Want know my work?</h1> <div> <p>See: <a href="https://scholar.google.com/citations?user=hPm3PDIAAAAJ&hl=pt-PT&oi=ao">My Google Scholar</a> <a href="https://dblp.org/pid/296/2589.html">My dblp</a>.</p> </div> <br> <div class="flex-container-work"> <div class="flex-item-work"> <br> <a class="index-link" href="#mentoring" ><p class="media-text">mentoring</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#publication" ><p class="media-text">publications</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#design" ><p class="media-text">design</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#text" ><p class="media-text">other text</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#notes" ><p class="media-text">notes</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#groups" ><p class="media-text">groups</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#organiser" ><p class="media-text">organiser</p></a> </div> </div> <div class="flex-container-work"> <div class="flex-item-work"> <br> <a class="index-link" href="#reviewer" ><p class="media-text">reviewer</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#standards" ><p class="media-text">standards</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#chair" ><p class="media-text">chairing</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#grants" ><p class="media-text">grants</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#award" ><p class="media-text">awards</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#media" ><p class="media-text">media</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#talks" ><p class="media-text">talks</p></a> </div> <div class="flex-item-work"> <br> <a class="index-link" href="#news" ><p class="media-text">news</p></a> </div> </div> <br> <a class="none" id="mentoring"><h2 class="divider">mentoring/supervising</h2></a> <p>I've mentored or I'm mentoring (as part of the Brave or Cloudflare internship program or others): <ul class="centered-list"> <li>Christian Knabenhans. Brave internship. His website can be found <a href="https://cknabs.github.io/" target="_blank">here</a>.</li> <li>Luiza Barros Reis Soezima. Individual Mentoring. Her website can be found <a href="https://luizabrs.github.io/" target="_blank">here</a>.</li> <li>Guilhem Niot. Individual Monitoring Committee Ph.D. Thesis.</li> <li>Elizabeth Margolin. Brave internship and Thesis Committee. Her website can be found <a href="https://ecmargo.github.io/" target="_blank">here</a>.</li> <li>Shai Levin. Brave internship. His website can be found <a href="https://profiles.auckland.ac.nz/shai-levin" target="_blank">here</a>.</li> <li>Joe Rowell. Brave internship. His website can be found <a href="https://pure.royalholloway.ac.uk/portal/en/persons/joe-rowell(01e6cf67-2447-49f8-9575-a60b42bda066).html" target="_blank">here</a>. Mentoring with Alex Davidson and Gonçalo Pestana.</li> <li>Lenka Mareková. Cloudflare internship. Their website can be found <a href="https://pure.royalholloway.ac.uk/portal/en/persons/lenka-marekova(371a2632-c1c4-4866-8141-c4b99807d326).html" target="_blank">here</a>. Mentoring with Bas Westerbaan.</li> <li>Thom Wiggers. Cloudflare internship. His website can be found <a href="https://thomwiggers.nl/" target="_blank">here</a>.</li> <li>Goutam Tamvada. Cloudflare internship. His website can be found <a href="https://www.linkedin.com/in/goutam-tamvada-8153a91b2/?originalSubdomain=ca" target="_blank">here</a>.</li> </ul> <br> <a class="none" id="publication"><h2 class="divider">academic publications</h2></a> <p>These is my list of scientific publications (from new to old):</p> <ul class="centered-list"> <li>'Share the MAYO: Thresholdizing MAYO' with Daniel Escudero and Guilhem Niot. <br> Conference paper. 16th International Conference on Post-Quantum Cryptography (PQCrypto 2025). <br> Find an extended version <a href="https://eprint.iacr.org/2024/1960" target"_blank">here</a>.<br> </li> <br> <li>'DiStefano: Decentralized Infrastructure for Sharing Trusted Encrypted Facts and Nothing More' with Alex Davidson, Hamed Haddadi, Gonçalo Pestana and Joe Rowell. <br> Conference paper. Network and Distributed Systems Security 2025 (NDSS 2025). <br> <i>Awarded with Distinguished Paper Award (DPA) at NDSS 2025</i>. <br>Find an extended version <a href="https://eprint.iacr.org/2023/1063.pdf" target"_blank">here</a>.<br> </li> <br> <li>'Call Me By My Name: Practical Keyword PIR' with Alex Davidson. <br>Conference paper. 31th ACM Conference on Computer and Communications Security (ACM CCS) 2024. <br>Artifact provided: Artifacts Available, Artifacts Evaluated--Functional, Results Reproduced. <br>Find an extended version <a href="https://eprint.iacr.org/2024/92.pdf" target"_blank">here</a>.<br> </li> <br> <li>'Nibbling MAYO: Optimized Implementations for AVX2 and Cortex-M4' with Ward Beullens, Fabio Campos, Basil Hess and Matthias J. Kannwischer. <br>Conference paper. Transactions on Cryptographic Hardware and Embedded Systems (TCHES) 2024 Issue 2. <br><i>Presented as well at the NIST's 5th PQC Standardization Conference 2024.</i> <br>Artifact provided: IACR CHES Results Reproduced. <br>Find an extended version <a href="https://eprint.iacr.org/2023/1683.pdf" target"_blank">here</a>.<br> </li> <br> <li>'CDLS: Committed Discrete Logarithms with Soundness' with Shai Levin and Joe Rowell. <br> Conference paper. International Conference on Cryptology in Africa 2024 (AfricaCrypt2024). <br>Find an extended version <a href="https://eprint.iacr.org/2023/1595.pdf" target"_blank">here</a>.<br> </li> <br> <li>'SoK: Signatures With Randomizable Keys' with Scott Griffy, Lucjan Hanzlik, Octavio Perez Kempner and Daniel Slamanig. <br>Conference paper. 28th International Conference on Financial Cryptography and Data Security (FC 2024). <br>Find an extended version <a href="https://eprint.iacr.org/2023/1524.pdf" target"_blank">here</a>.<br> </li> <br> <li>'Practically-exploitable Cryptographic Vulnerabilities in Matrix' with Martin R. Albrecht, Benjamin Dowling and Daniel Jones. <br>Symposium Proceedings. 44th IEEE Symposium on Security and Privacy (IEEE S&P) 2023. (Acceptance rate: 17.1%, 196/1147). <br>Find an extended version <a href="https://nebuchadnezzar-megolm.github.io/static/paper.pdf" target"_blank">here</a>. See our website <a href="https://nebuchadnezzar-megolm.github.io/" target"_blank">here</a>.<br> <i>Awarded with Distinguished Paper Award (DPA) at IEEES&P 2023</i>. <br> <i>Finalist for the 2023 Pwnie award. See it <a href="https://www.darkreading.com/edge/meet-the-finalists-for-the-2023-pwnie-awards" target="_blank">here</a></i>. </li> <br> <li>'FrodoPIR: Simple, Scalable, Single-Server Private Information Retrieval' with Alex Davidson and Gonçalo Pestana. <br>Peer-reviewed journal. Proceedings on Privacy Enhancing Technologies (PETS). Vol. 2023, Issue 1. (Acceptance rate: 22%, 123/563). <br>Find an extended version <a href="https://eprint.iacr.org/2022/981.pdf" target"_blank">here</a>.</li> <br> <li>'A tale of two models: formalizing KEMTLS in Tamarin' with Thom Wiggers, Jonathan Hoyland, Douglas Stebila. <br> Conference paper. 27th European Symposium on Research in Computer Security (ESORICS) 2022. <br> Find it <a href="https://link.springer.com/chapter/10.1007/978-3-031-17143-7_4" target="_blank">here</a>, and an extended version <a href="https://eprint.iacr.org/2022/1111.pdf" target"_blank">here</a>. <br> <i>Runner-up for best paper award at ESORICS2022.</i> <br> <i>Invited to special issue on the Journal of Computer Security: authors decided not to submit.</i> </li> <br> <li>'Implementing and Measuring KEMTLS' with Armando Faz-Hernández, Nick Sullivan, Goutam Tamvada, Luke Valenta, Thom Wiggers, Bas Westerbaan and Christopher A. Wood. <br> Conference paper. International Conference on Cryptology and Information Security in Latin America 2021 (LatinCrypt2021). <br> Find it <a href="https://link.springer.com/chapter/10.1007/978-3-030-88238-9_5" target="_blank">here</a>, and an extended version <a href="https://eprint.iacr.org/2021/1019" target"_blank">here</a>. </li> <br> <li>'A Fast and Simple Partially Oblivious PRF, with Applications' with Nirvan Tyagi, Thomas Ristenpart, Nick Sullivan, Stefano Tessaro, and Christopher A. Wood. <br> Conference paper. International Conference on the Theory and Applications of Cryptographic Techniques in Europe 2022 (EuroCrypt2022). <br> Find it <a href="https://link.springer.com/chapter/10.1007/978-3-031-07085-3_23">here</a> and an extended version <a href="https://eprint.iacr.org/2021/864.pdf" target="_blank">here</a>.</li> <i>Specified by IRTF in <a href="https://www.rfc-editor.org/rfc/rfc9497.txt" target="_blank">RFC9497</a> (note that this is an 'Information specification' and does not represent an Internet Standard) for its use in the standarised Internet protocol <a href="https://www.rfc-editor.org/rfc/rfc9578.txt" target="_blank">Privacy Pass</a> (which I'm a co-author of).</i> <br> </ul> <br> <a class="none" id="design"><h2 class="divider">cryptographic/technology design</h2></a> <ul class="centered-list"> <li>'MAYO PQC Signature scheme' with Ward Beullens, Fabio Campos, Basil Hess and Matthias J. Kannwischer. <br>Find the specification <a href="https://pqmayo.org/assets/specs/mayo.pdf" target"_blank">here</a>. See our website <a href="https://pqmayo.org/" target"_blank">here</a>.<br> <i>Candidate selected for the 2nd round of the "on-ramp" PQC NIST standardization.</i><br><br> </li> <li>'OTR-mode' with Mark Pilgrim, Shivan Sahib and Pete Snyder. <br>Find the blogpost <a href="https://brave.com/privacy-updates/26-request-off-the-record/" target"_blank">here</a>.<br> <br> </li> </ul> <a class="none" id="award"><h2 class="divider">awards</h2></a> <ul class="centered-list"> <li><strong>Distinguished Paper Award (DPA), 2025</strong> – Awarded at NDSS 2025 in recognition of an outstanding paper in the field of network and distributed system security research.</li> <li><strong>Distinguished Human Rights Defender, 2025</strong> – Honoured by the Institute on Human Rights, Diversity, and Inclusion in 2025 for significant contributions to social justice and advocacy.</li> <li><strong>Distinguished Paper Award (DPA), 2023</strong> – Awarded at IEEE S&P 2023 for exceptional research in cryptography and security.</li> <li><strong>Runner-up for the Pwnie Award, 2023</strong> – Nominated in 2023 for excellence in the field of security research.</li> <li><strong>Runner-up for Best Paper Award, 2022</strong> – Recognized at ESORICS 2022 for significant contribution to research.</li> <li><strong>First Class Honours</strong> – Earned at the University of London for outstanding academic performance.</li> <li><strong>Best Literature Short Story Award</strong> – Awarded in 2009 by Universidad San Francisco de Quito for excellence in creative writing.</li> <li><strong>Roll of Honour at the National Conservatory of Music</strong> – Recognized for excellence in musical studies and performance.</li> <li><strong>Academic Scholarship for University Studies</strong> – Awarded by Universidad Católica del Ecuador, 2012-2017, for outstanding academic achievement.</li> <li><strong>Recipient of an Academic Scholarship for High School Studies</strong> – Recognized for exceptional academic performance during secondary education.</li> </ul> <br> <a class="none" id="groups"><h2 class="divider">my groups</h2></a> <ul class="centered-list"> <li>The amazing Brave Research Team as a Senior Cryptography and Security Researcher.</li> <li><a href="https://criptolatino.org/" target="_blank">Criptolatino</a>. Ping me or any of the members for joining!</li> <li><a href="https://www.womenincryptography.com/" target="_blank">Women in Cryptography</a>. Ping Allison Bishop, Katharina Boudgoust or myself for joining!</li> <li>PQC MAYO scheme team. Find our website <a href="https://pqmayo.org/" target="_blank">here</a>.</li> <li>The Lattice Club with Octavio Pérez Kempner. Find our website <a href="https://thelatticeclub.com/" target="_blank">here</a>.</li> <li>The Steering Committee of Latincrypt.</li> <li>Collaborating with Open Quantum Safe (OQS).</li> <li>Criptógrafas Latinoamericanas.</li> <li>Red de investigación en criptografía.</li> </ul> <br> <a class="none" id="chair"><h2 class="divider">conference/academic chair</h2></a> <ul> <li>Co-chair of the Research Ethics Committee (REC) of the IEEE Symposium on Security and Privacy (IEEE S&P). 2026.</li> <li>Part of the Code of Conduct team at Eurocrypt. 2025.</li> <li>IACR e-print co-editor. 2025.</li> <li>Publicity/Web Chair at Privacy Enhancing Technologies Symposium (PETS). 2025-2026.</li> <li>Chair of affiliated events of <a href="https://crypto.iacr.org/2025" target="_blank">CRYPTO2025</a>.</li> <li>Award Chair at International Conference on Applied Cryptography and Network Security (ACNS). 2024.</li> <li>Co-chair of <a href="https://ascrypto.org/" target="_blank">Advanced School in Cryptography (ASCrypto)</a>, 2023, as part of LatinCrypt2023 and an official <a href="https://iacr.org/schools/" target="_blank">IACR Cryptology School</a>.</li> </ul> <br> <a class="none" id="organiser"><h2 class="divider">organizer</h2></a> <p>I love organizing summits and gatherings:</p> <ul class="centered-list"> <li>OTRv4 summit colocated with PETS2019, Stockholm, Sweden. Find more information <a href="https://petsymposium.org/2019/program.php" target="_blank">here</a> and <a href="https://otr.im/" target="_blank">here</a>.</li> <li>Secure messaging summit 2020. Find more information <a href="https://github.com/claucece/Secure-Messaging-Summit" target="_blank">here</a>.</li> <li>Meeting around Deniability at <a href="https://rwc.iacr.org/2021/" target="_blank">Real World Crypto 2021</a>. Find more information <a href="https://rwc.iacr.org/2021/affiliated.php" target="_blank">here</a>.</li> <li>Informal meeting around Anonymous Credentials at <a href="https://rwc.iacr.org/2021/" target="_blank">Real World Crypto 2021</a>. Find more information <a href="https://rwc.iacr.org/2021/affiliated.php" target="_blank">here</a>.</li> <li>Workshop on digital rights for Latin American women at Taller de Comunicación Mujer.</li> <li>Second meeting around Anonymous Credentials. Find more information <a href="https://www.sofiaceli.com/Anonymous-Credentials-Meeting/" target="_blank">here</a>.</li> <li>Post-quantum cryptography and networks (PQNet). Find more information <a href="https://www.sofiaceli.com/PQNet-Workshop/" target="_blank">here</a>.</li> <li>Criptolatino: the Latin American community of cryptographers workshop at LatinCrypt2021. Find more information <a href="https://www.criptolatino.org/workshop.html" target="_blank">here</a>.</li> <li>Post-quantum cryptography and networks (PQNet) at RWC2022. Find more information <a href="https://sofiaceli.com/PQNet-Workshop/" target="_blank">here</a>.</li> <li>Cryptography school in Caparica.</li> </ul> <br> <a class="none" id="reviewer"><h2 class="divider">reviews/advisor</h2></a> <p>I've served in these <strong>program committees</strong>:</p> <ul> <li>ACM CCS. 2025. See what it is about <a href="https://www.sigsac.org/ccs/CCS2025/" target="_blank">here</a>.</li> <li>Privacy Enhancing Technologies Symposium (PETS). 2024, 2025, 2026. See what it is about <a href="https://www.petsymposium.org/" target="_blank">here</a>.</li> <li>USENIX Security Symposium. 2025. See what it is about <a href="https://www.usenix.org/conference/usenixsecurity24" target="_blank">here</a>.</li> <li>IEEE Symposium on Security and Privacy (S&P). 2024. See what it is about <a href="https://www.ieee-security.org/TC/SP2024/cfpapers.html" target="_blank">here</a>.</li> <li>Real World Crypto (RWC). 2023, 2024. See what it is about <a href="https://rwc.iacr.org/2023/" target="_blank">here</a>.</li> <li>Public Key Cryptography (PKC). 2024, 2025. See what it is about <a href="https://pkc.iacr.org/2024/" target="_blank">here</a>.</li> <li>International Conference on Cryptology and Information Security in the Asia-Pacific region (Asiacrypt). 2025. See what it is about <a href="https://www.iacr.org/meetings/asiacrypt/" target="_blank">here</a>.</li> <li>International Conference on Cryptology and Information Security in Latin America (Latincrypt). 2023. See what it is about <a href="https://www.espe.edu.ec/latincrypt/" target="_blank">here</a>.</li> <li>International Conference on Cryptology in India (Indocrypt). 2025. See what it is about <a href="https://indocrypt.org/" target="_blank">here</a>.</li> <li>ACM ASIA Conference on Computer and Communications Security (ACM ASIACCS). 2024, 2025. See what it is about <a href="https://asiaccs2023.org/" target="_blank">here</a>.</li> <li>International Conference on Applied Cryptography and Network Security (ACNS). 2024. See what it is about <a href="https://wp.nyu.edu/acns2024/" target="_blank">here</a>.</li> <li>SAC. 2024, 2025. See what it is about <a href="https://sacworkshop.org/" target="_blank">here</a>.</li> <li>CT-RSA. 2025. See what it is about <a href="https://ct-rsa-2024.aau.at/" target="_blank">here</a>.</li> <li>IEEE European Symposium on Security and Privacy (Euro S&P). 2025. See what it is about <a href="https://eurosp2023.ieee-security.org/" target="_blank">here</a>.</li> <li>International Conference on Applied Cryptography and Network Security (CANS). 2025. See what it is about <a href="https://cy2sec.comm.eng.osaka-u.ac.jp/miyaji-lab/event/cans2025/Call%20for%20Papers.html" target="_blank">here</a>.</li> <li>Information Security Conference (ISC). 2024. See what it is about <a href="http://www.wikicfp.com/cfp/program?id=1679" target="_blank">here</a>.</li> <li>EuroSec. 2024. See what it is about <a href="http://www.wikicfp.com/cfp/program?id=975" target="_blank">here</a>.</li> <li>Security Standardisation Research Conference (SSR). 2022, 2023, 2024. See what it is about <a href="https://ssr2022.com/cfp/" target="_blank">here</a>.</li> <li>ACM Workshop on SW Supply Chain Offensive Research and Ecosystem Defenses (SCORED). 2022, 2023, 2024. See what it is about <a href="https://scored.dev/" target="_blank">here</a>.</li> <li>Workshop on Real World and PQC. 2023. See what it is about <a href="https://rwpqc.org/" target="_blank">here</a>.</li> <li>1st Workshop on Cryptography Applied to Transparency Systems (CATS). 2024. See what it is about <a href="https://catsworkshop.dev/" target="_blank">here</a>.</li> <li>Workshop on Offensive Technologies (WOOT). 2023, 2024. See what it is about <a href="https://wootconference.org/" target="_blank">here</a>.</li> <li>Workshop on High Assurance Crypto Software (HACS). 2023, 2024, 2025. See what it is about <a href="https://www.hacs-workshop.org/" target="_blank">here</a>.</li> <li>Conference for Failed Approaches and Insightful Losses in Cryptology (CFAIL). 2023, 2024. See what it is about <a href="https://www.cfail.org/" target="_blank">here</a>.</li> <li>ETSI-IQC Quantum-Safe Cryptography Workshop. 2024, 2025. See what it is about <a href="https://www.etsi.org/events/2117-2023-02-9th-etsi-iqc-quantum-safe-cryptography-workshop" target="_blank">here</a>.</li> <li>Quantum-Resistant Cryptography Workshop. 2025. See what it is about <a href="https://eurocrypt.iacr.org/2025/affiliated.php" target="_blank">here</a>.</li> <li>PrivCrypt Workshop. 2025. See what it is about <a href="https://privcryptworkshop.github.io/" target="_blank">here</a>.</li> <li>International Workshop on Security (IWSEC). 2025. See what it is about <a href="https://www.iwsec.org/2025/index.html" target="_blank">here</a>.</li> <li>Workshop on Secure Protocol Implementations in the Quantum Era (SPIQE). 2025. See what it is about <a href="https://www.iwsec.org/2025/index.html" target="_blank">here</a>.</li> </ul> <br> <p>I've served in these <strong>ethics committees</strong>:</p> <ul> <li>Research Ethics Committee (REC) at IEEE Symposium on Security and Privacy (S&P). 2024. See what it is about <a href="https://www.ieee-security.org/TC/SP2024/cfpapers.html" target="_blank">here</a>.</li> </ul> <br> <p>I've served in these <strong>awards committees</strong>:</p> <ul> <li>Applied Networking Research Prize 2023, 2024, 2025. See what it is about <a href="https://irtf.org/anrp/" target="_blank">here</a>.</li> </ul> <br> <p>I'm part of these <strong>editorial boards</strong>:</p> <ul> <li>IACR Communications in Cryptology 2025. See what it is about <a href="https://cic.iacr.org/" target="_blank">here</a>.</li> </ul> <br> <p>I am/I was part of the <strong>review committee for these events</strong>:</p> <ul> <li>Subreviewer: CRYPTO, 2025.</li> <li>Subreviewer: The 29th Australasian Conference on Information Security and Privacy, 2024.</li> <li>Subreviewer: LATIN: The 15th Latin American Theoretical Informatics Symposium, 2022.</li> <li>Blackhat Review Board, 2024.</li> <li>CRYPTO Artefact Review Committee, 2024. See what is it about <a href="https://crypto.iacr.org/2024/callforartifacts.php" target="_blank">here</a>.</li> <li>PETS 2020,2021,2022,2023,2024: Artefact Review Committee. See what is it about <a href="https://petsymposium.org/artifacts.php" target="_blank">here</a>.</li> <li>USENIX: Artefact Review Committee, 2020. See what is it about <a href="https://www.usenix.org/conference/usenixsecurity20/artifact-evaluation-information" target="_blank">here</a>.</li> <li>Journal of Cryptographic Engineer 2022.</li> </ul> <br> <p>I <strong>advice</strong>:</p> <ul> <li><a href="https://www.globalencryption.org/" target="_blank">Global Encryption Coalition</a>.</li> <li><a href="https://www.opentech.fund/" target="_blank">Open Technology Fund</a>.</li> </ul> <br> <p>I <strong>review grant proposals</strong> at:</p> <ul class="centered-list"> <li>Digital Infrastructure Insights Fund (D//F). 2023-2024. See what is it about <a href="https://fordfoundation.forms.fm/2023-digital-infrastructure-insights-fund-rfp/forms/9724" target="_blank">here</a>.</li> </ul> <br> <a class="none" id="standards"><h2 class="divider">IETF/IRTF/W3C roles</h2></a> <ul> <li>Co-chair of the Human Rights Protocols Considerations group (HRPC) at IRTF. See what it is about <a href="https://datatracker.ietf.org/rg/hrpc/about/" target="_blank">here</a>. Chairing with Mallory Knodell.</li> <li>Co-chair of the Post-Quantum Use In Protocols (PQUIP) at IETF. See what it is about <a href="https://datatracker.ietf.org/wg/pquip/about/" target="_blank">here</a>. Chairing with Paul Hoffman.</li> <li>Co-chair of the Anti-Fraud community group at W3C. See what it is about <a href="https://www.w3.org/community/antifraud/" target="_blank">here</a>. Chairing with Steven Valdez.</li> <li>Part of the IETF Ombudsteam. See what it is about <a href="https://www.ietf.org/contact/ombudsteam/" target="_blank">here</a>.</li> <li>Part of the Public Interest Technology Group. See what it is about <a href="https://pitg.gitlab.io/" target="_blank">here</a>.</li> <li>Part of the IRTF's Diversity Travel Grants Committee. See what it is about <a href="https://www.irtf.org/travelgrants/" target="_blank">here</a>.</li> </ul> <br> <a class="none" id="grants"><h2 class="divider">grants/sponsorships received</h2></a> <p>For my work, I sometimes receive grants or sponsorships:</p> <ul class="centered-list"> <li>Institut Cybersécurité Occitanie (ICO), 2025. A grant for creating the <i>Decrypting Diversity</i> Summit in France.</li> <li>Collaborative Research Center CROSSING, 2025. A grant for creating the <i>Decrypting Diversity</i> Summit in France.</li> <li>Centre International de Mathématiques Pures et Appliquées (CIMPA), 2025. A grant for creating a CIMPA School in Chile.</li> <li>International Association for Cryptologic Research (IACR), 2023. A grant for creating the ASCrypto2023 School in Ecuador.</li> <li>NLnet and NGIO Zero: NGI0 PET Fund, 2020. A grant received for continuing work on the OTRv4 project. Find more information <a href="https://nlnet.nl/project/OTR4/" target="_blank">here</a>.</li> <li>Cloudflare: Sponsorship for Cryptography Research, 2020.</li> <li>USENIX Security '20: Diversity grant.</li> <li>Grant to attend HACS, 2020.</li> <li>Article19: Grant to attend IETF106.</li> <li>Rails Girls Summer of Code fellowship, 2015.</li> </ul> <br> <a class="none" id="media"><h2 class="divider">interviews/media coverage</h2></a> <p>Some media coverage:</p> <ul class="centered-list"> <li>Cryptography FM. Find it <a href="https://share.fireside.fm/episode/UhS0As4h+_FDaArw-" target="_blank">here</a>.</li> <li>Radios Libres. Find it <a href="https://radioslibres.net/programadoras-de-america-latina-sofia-celi-ramos/" target="_blank">here</a>.</li> <li>The Daily Swig, around KEMTLS. Find it <a href="https://portswigger.net/daily-swig/kemtls-cloudflare-trials-new-encryption-mechanism-in-anticipation-of-post-quantum-tls-shortcomings" target="_blank">here</a>.</li> <li>GK, around learning to program and childhood. Find it <a href="https://gk.city/2020/10/25/beneficios-aprender-programacion-ninos-ninas/" target="_blank">here</a>.</li> <li>Portrait de Sofía Celi, Ingénieure en cryptographie chez CloudFare. Find it <a href="https://www.duchess-france.org/category/speakeuses/" target="_blank">here</a>.</li> <li>'Modern and Quantum Cryptography - what does the future hold?' at Distributed Future. Find it <a href="https://distributedfutu.re/#episode75" target="_blank">here</a>.</li> <li>'Da criptografia à computação quântica' at Made In Tech. Find it <a href="https://www.dinheirovivo.pt/empresas/tecnologia/sofia-celi-como-a-criptografia-e-a-computacao-quantica-podem-ter-um-impacto-inimaginavel-14964377.html" target="_blank">here</a>.</li> <li>'Serious vulnerabilities in Matrix’s end-to-end encryption have been patched' at Ars Technica. Find it <a href="https://arstechnica.com/information-technology/2022/09/matrix-patches-vulnerabilities-that-completely-subvert-e2ee-guarantees/" target="_blank">here</a>.</li> <li>'IETF launches post-quantum encryption working group' at IETF News. Find it <a href="https://www.ietf.org/blog/pquip/" target="_blank">here</a>.</li> <li>'Criptografia na América Latina e no Caribe - Entrevista com Sofía Celi' at ObCrypto. Find it <a href="https://obcrypto.org/post/criptografia-na-america-latina-e-caribe-entrevista-com-sofia-celi/" target="_blank">here</a>.</li> <li>'FrodoPIR: New Privacy-Focused Database Querying System' at The Hacker News. Find it <a href="https://thehackernews.com/2022/12/frodopir-new-privacy-focused-database.html" target="_blank">here</a>.</li> <li>Profile at Forbes Ecuador. Find it <a href="https://www.forbes.com.ec/movimiento-inspirador/como-hizo-esta-quitena-ser-parte-debrave-software-convertirse-una-autoridad-criptografia-n52362" target="_blank">here</a>.</li> </ul> <br> <a class="none" id="text"><h2 class="divider">published text</h2></a> <p>I have some other informal published texts:</p> <ul class="centered-list"> <li>'No evidence of communication: Off-The-Record Protocol version 4'. Find it <a href="https://petsymposium.org/2018/files/hotpets/7-bini.pdf" target="_blank">here</a>. This extended abstract was written for HotPETS from PETS2018.</li> <li>'Privacy and deniability by design: Off-the-Record messaging version 4'. Find it <a href="https://petsymposium.org/2019/files/workshop/abstracts/PUT_2019_paper_17.pdf" target="_blank">here</a>. This extended abstract was written for PUT2019.</li> <li>'The current state of denial'. Find it <a href="https://petsymposium.org/2020/files/hotpets/The_current_state_of_denial.pdf" target="_blank">here</a>. This extended abstract was written for HotPETS from PETS2020. This is a joint collaboration with Iraklis Symeonidis.</li> <li>Contributor at 'Oblivious Pseudorandom Functions (OPRFs) using Prime-Order Groups'. Find it <a href="https://datatracker.ietf.org/doc/draft-irtf-cfrg-voprf/" target="_blank">here</a>.</li> <li>Author of 'Privacy Pass: The Protocol' RFC. Find it <a href="https://github.com/ietf-wg-privacypass/base-drafts" target="_blank">here</a>.</li> <li>Author of 'Definition of End-to-end Encryption'. Find it <a href="https://datatracker.ietf.org/doc/draft-knodel-e2ee-definition/" target="_blank">here</a>.</li></li> <li>Reviewer and happy collaborator to 'Crypto Dictionary' from the amazing JP Aumasson. Find it <a href="https://nostarch.com/crypto-dictionary" target="_blank">here</a>.</li> <li>Blogpost at Cloudflare with Thom Wiggers: "KEMTLS: Post-quantum TLS without signatures". Find it <a href="https://blog.cloudflare.com/kemtls-post-quantum-tls-without-signatures/" target="_blank">here</a>.</li> <li>"On the Importance of Understanding Memory Handling" for Welcome to the Jungle. Find it <a href="https://www.welcometothejungle.com/en/articles/btc-memory-handling" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Pop Chunhapany and Armando Faz-Hernández: "Privacy Pass v3: the new privacy bits". Find it <a href="https://blog.cloudflare.com/privacy-pass-v3/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare: "The quantum solace and spectre". Find it <a href="https://blog.cloudflare.com/quantum-solace-and-spectre/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare: "The post-quantum state: a taxonomy of challenges". Find it <a href="https://blog.cloudflare.com/post-quantum-taxonomy/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Goutam Tamvada: "Deep dive into a post-quantum signature scheme". Find it <a href="https://blog.cloudflare.com/post-quantum-signatures/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Goutam Tamvada: "Deep dive into a post-quantum key encapsulation algorithm". Find it <a href="https://blog.cloudflare.com/post-quantum-key-encapsulation/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Goutam Tamvada: "Using EasyCrypt and Jasmin for post-quantum verification". Find it <a href="https://blog.cloudflare.com/post-quantum-easycrypt-jasmin/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Goutam Tamvada and Thom Wiggers: "Post-quantumify internal services: Logfwrdr, Tunnel, and gokeyless". Find it <a href="https://blog.cloudflare.com/post-quantumify-cloudflare/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Nick Sullivan: "The post-quantum future: challenges and opportunities". Find it <a href="https://blog.cloudflare.com/post-quantum-future/" target="_blank">here</a>.</li> <li>Blog post at Cloudflare with Angela Huang: "International Women’s Day 2022". Find it <a href="https://blog.cloudflare.com/international-womens-day-2022/" target="_blank">here</a>.</li> <li>Blog post at Brave with Alex Davidson and Gonçalo Pestana: "FrodoPIR: a new privacy-preserving approach for retrieving data". Find it <a href="https://brave.com/frodopir/" target="_blank">here</a>.</li> <li>IRTF draft: "Intimate Partner Violence Digital Considerations" with Juliana Guerra and Mallory Knodel. Find it <a href="https://datatracker.ietf.org/doc/draft-celi-irtf-hrpc-ipvc/" target="_blank">here</a>.</li> <li>Blog post at Brave: "Commitments and zero-knowledge attestations over TLS 1.3: DiStefano protocol". Find it <a href="https://brave.com/blog/distefano/" target="_blank">here</a>. Joint work with Sebastian Angel, Alex Davidson, Hamed Haddadi, Shai Levin, Elizabeth Margolin, Gonçalo Pestana, Joe Rowell, Jess Woods.</li> <li>Literature narrative on "Narrativas de poder - revelando a quienes acechan en lo digital" from Gender-IT at APC.</li> </ul> <br> <a class="none" id="notes"><h2 class="divider">notes</h2></a> <p>Some informal notes and thoughts:</p> <ul class="centered-list"> <li>'A note on Privacy-Preserving Measurements Techniques'. Find it <a href="/thoughts/ppm-tech-01.pdf" target="_blank">here</a>. Extra material for a PEARG presentation.</li> <li>'STAR and verifiability of shares'. Find it <a href="https://sofiaceli.com/thoughts/STAR_verification.pdf" target="_blank">here</a>. Extra material for a PPM presentation.</li> <li>'The Boomerang protocol: A Decentralised Privacy-Preserving Verifiable Incentive Protocol'.</li> <br> </ul> <br> <p>Some statements to improve diversity and inclusion:</p> <ul class="centered-list"> <li>'On Creating a More Inclusive and Supporting Community' with Elena Pagnin and Akira Takahashi. Find it <a href="https://github.com/claucece/diversity-inclusion-statement/blob/main/On%20Creating%20a%20More%20Inclusive%20and%20Supporting%20Community.pdf" target="_blank">here</a>.</li> </ul> <br> <a class="none" id="talks"><h2 class="divider">scientific talks</h2></a> <p>These are my scientific talks (organised by old to new. For policy talks, see the next section):</p> <ul class="centered-list"> <li><i>Contributed talk:</i> "Elliptic Curves: from magic to Goldilocks" at CryptoRave2018, São Paulo, Brazil (2018).</li> <li><i>Contributed talk:</i> "No evidence of communication: Off-The-Record Protocol version 4" at PETS2018, Barcelona, Spain (2018). Watch the talk<a href="https://www.youtube.com/watch?v=Gwq28q1cWaM&list=PLWSQygNuIsPd6YJmGV9kn1mP2A6-IBCoU&index=43" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "No evidence of communication: OTRv4 (Off-the-Record) v4" at the Privacy Enhancements and Assessments Proposed Research Group (PEARG) from IETF 103 (2018).</li> <li><i>Contributed talk:</i> "No evidence of communication and morality in protocols: Off-the-Record protocol version 4", at the 35th Chaos Computer Congress (35c3), Leipzig, Germany, with Jurre van Bergen (2018). Watch the talk<a href="https://www.youtube.com/watch?v=KR4s6t9D9Jo" target="_blank">here</a>.</li></li> <li><i>Invited talk:</i> "Deniability in a group chat setting" at the Message Layer Security (MLS) group from IETF (2019).</li> <li><i>Contributed talk:</i> "No evidence of communication and implementing a protocol: Off-the-Record protocol version 4" at FOSDEM, Brussels, Belgium (2018). Watch the talk<a href="https://fosdem.org/2019/schedule/event/otr4/" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Clang tools for implementing cryptographic protocols like OTRv4" at Euro Developers meeting, Brussels, Belgium (2018). Watch the talk<a href="https://llvm.org/devmtg/2019-04/talks.html#Talk_17" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "A case around secure messaging: OTRv4" at the Computer Security and Industrial Cryptography (COSIC) from the Katholieke Universiteit Leuven, Leuven, Belgium (2019). Watch the talk<a href="https://www.youtube.com/watch?v=JYTEn2as0Rg&t=3s" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "The loss of the sovereignty in privacy" at Security in Times of Surveillance event, Eindhoven, The Netherlands (2019). Watch the talk <a href="https://www.win.tue.nl/eipsi/abstracts-2019.html#celi" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "A case around secure messaging: OTRv4" at EI/Ψ seminar from the Eidenhoven University of Technology, Eindhoven, The Netherlands (2019). Find more information<a href="https://yx7.cc/orga/eipsi/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "A case around secure messaging: OTRv4" at DS Colloquium from the Radboud University in Nijmegen, The Netherlands (2019). Find the information <a href="https://www.sos.cs.ru.nl/colloquium/index.html#past" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Privacy and Deniability by Design: Off-the-Record Messaging Version 4" at the Open Day for Privacy, Usability, and Transparency (PUT) co-located with PETS, Stockholm, Sweden (2019). Find the information <a href="https://www.sos.cs.ru.nl/colloquium/index.html#past" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "A Case Around Secure Messaging: OTRv4" at Ss. Cyril and Methodius University, Skopje, Macedonia (2019). Find more information <a href="https://www.sos.cs.ru.nl/colloquium/index.html#past" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Off-the-Record" at HotRFC during IETF 106, Singapore (2019). Find more information <a href="https://datatracker.ietf.org/meeting/106/session/hotrfc" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Security and Privacy: An Unsustainable Balance" at "Our Data, Our Future: Radical Tech for a Democratic Digital Society" by DECODE, Turin, Italy (2019). Find more information <a href="https://decodeproject.eu/events/workshops-agenda-5th-november" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "The State of Secure Messaging: The Case of OTR" at the Critical Decentralisation Cluster during the 36c3, Chaos Computer Congress, Leipzig, Germany (2019). Find more information <a href="https://frab.riat.at/en/36C3/public/events/123" target="_blank">here</a>.</li> <li><i>Panel discussion:</i> "Communicating in a Private Way: Should We Care?" at the Critical Decentralisation Cluster (2020), Leipzig, Germany (2019). Find more information <a href="https://www.cpdpconferences.org/events/communicating-in-a-private-way-why-should-you-care" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "A Case Around Secure Messaging: OTRv4" at the University of Luxembourg, Luxembourg (2020).</li> <li><i>Panel discussion:</i> "Communicating in a Private Way: Should We Care?" at the Luxembourg Legal Hackers Meetup (2020). Find more information <a href="https://wwwfr.uni.lu/layout/set/print/snt/news_events/luxembourg_legal_hackers_meetup_communicating_in_a_private_way_why_should_you_care" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Why Golang" at Women Who Go Paris (2020). Find more information <a href="https://www.meetup.com/Women-Who-Go-Paris/events/269712560/" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "The Current State of Denial" at HotPETS during PETS (2020). Find more information <a href="https://petsymposium.org/2020/program.php" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "The Devil is in the Detail: Designing and Implementing OTRv4" at The 8th Technion Summer School on Cyber and Computer Security (2020). Find more information <a href="https://cyber.technion.ac.il/2020-summer-school-on-cyber-computer-security/2020-summer-school-on-cyber-computer-security-program/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "The Double-Ratchet Algorithm: Security and Privacy Properties" at Cryptography Meetup (2020). Find more information <a href="https://secure.meetup.com/register/?referrer_n=event&referrer_i=273279079&ctx=ref" target="_blank">here</a>.</li> <li><i>TV talk:</i> "Las Siete Vidas de un Gato Post-Quántico" with Armando Faz at CFTV from Cloudflare (2020). Find the information <a href="https://cloudflare.tv/event/5G46CmInDoEyAFmk9Ewi3O" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "The State of Digital Rights in Latin America" at RC3 (2020). Find the recording <a href="https://media.ccc.de/v/rc3-11526-the_state_of_digital_rights_in_latin_america" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Post-Quantum TLS without Handshake Signatures" with Peter Schwabe, Douglas Stebila, Thom Wiggers, and Armando Faz at Real World Crypto (2021). Find more information <a href="https://rwc.iacr.org/2021/program.php" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "'I Thought I Was Being Strong with a Complicated Person': The Tales of Intimate Gender-Based Online Abuse in the Global South" at Enigma, a Usenix Conference (2021). Find more information <a href="https://www.usenix.org/conference/enigma2021" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "The State of Denial" at the Research Seminar in the Information Security Group at Royal Holloway (2021). Find more information <a href="https://seminars.isg.rhul.ac.uk/d/2021-02-11" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "DMLS: Deniable MLS" at the MLS Working Group, IETF 110 (2021). Find more information <a href="https://github.com/mlswg/wg-materials/tree/master/ietf110" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "OPAQUE with TLS 1.3" at the TLS Working Group, IETF 110 (2021). Find more information <a href="https://github.com/tlswg/wg-materials/blob/master/ietf110/agenda.md" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Anonymous Credentials: Highlights from the Meeting" at Privacy Pass Working Group, IETF 110 (2021).</li> <li><i>TV talk:</i> "KEMTLS" with Thom Wiggers at CFTV from Cloudflare (2021). Find more information <a href="https://cloudflare.tv/event/2Mh0Mwr8QXtZ5tla9qSIbk" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Introducción a la Criptografía" at Kriptos (2021).</li> <li><i>Invited talk:</i> "A Fast and Simple Partially Oblivious PRF, with Applications" with Nirvan Tyagi at Brave Browser Research (2021).</li> <li><i>Invited talk:</i> "PO-PRFs" at CFRG at IETF111 with Armando Faz-Hernández (2021). Find the information <a href="https://datatracker.ietf.org/meeting/111/materials/agenda-111-cfrg-04" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Public Metadata and Privacy Pass" at IETF111 (2021). Find the information <a href="https://datatracker.ietf.org/meeting/111/materials/agenda-111-privacypass-00" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Authentication with KEMs for TLS1.3" with Thom Wiggers at IETF111 (2021). Find the information <a href="https://datatracker.ietf.org/meeting/111/materials/agenda-111-tls-02" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "End-to-end encryption" with Mallory Knodell at SecDispatch at IETF111 (2021). Find the information <a href="https://datatracker.ietf.org/meeting/111/materials/agenda-111-secdispatch-04" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Gallery of Latin American Malware" at SOUPS (2021). Find the information <a href="https://www.usenix.org/conference/soups2021/technical-sessions" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Implementing and Measuring KEMTLS" at Google Cryptographic Group with Armando-Faz Hernández (2021).</li> <li><i>Invited talk:</i> "Introductions to networks and post-quantum algorithms using isogenies" at Isogeny-based Cryptography School (2021). Find the information <a href="https://www.sofiaceli.com/PQNet-Workshop/" target="_blank">here</a>.</li> <li><i>Keynote talk:</i> "How private is secure messaging?" at the Conference on Selected Areas in Cryptography (2021). Find the information <a href="https://www.sac2021.ca/program" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "OPRFs: what they are, new constructions and new applications" at TII CRC Seminar Series (2021). Find the information <a href="https://www.tii.ae/article/crc-seminar-series-sofia-celi" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Implementing and Measuring KEMTLS" at Latincrypt (2021). Find the information <a href="https://www.urosario.edu.co/Latin-Crypt/inicio/#Agenda" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Privacy Pass attacks in practice" at Anti-Fraud for the Web breakout session at TPAC, W3C (2021). Find the information <a href="https://web-eur.cvent.com/event/2b77fe3d-2536-467d-b71b-969b2e6419b5/websitePage:efc4b117-4ea4-4be5-97b4-c521ce3a06db" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "OPRFs: past and future" at the Cornell's Security Seminar (2021). Find the information <a href="https://www.cs.cornell.edu/secdg/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Desde curvas elípticas a teoría quántica: Qué es la criptografía?" at the Congreso Trascendencias, Universidad Campus Mexicali (2021). Find the information <a href="https://www.cetys.mx/noticias/acercando-el-futuro-trascendencias-2021/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Introduction to Cryptography" at the 21st edition of Semana de Informática at the Faculty of Engineering of the University of Porto, Portugal (2021). Find the information <a href="https://www.sinf.pt/talks/cryptography" target="_blank">here</a>.</li> <li><strong>Cancelled:</strong> "Challenges of isogenies in post-quantum cryptography for the real-world" at the Isogeny School (2022).</li> <li><i>Invited talk:</i> "TLS and post-quantum" at PQNet (2022). Find the information <a href="https://sofiaceli.com/PQNet-Workshop/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "De Turing a Shor: la computación" at Días de las Niñas en TIC (2022). Find the information <a href="https://openlab.ec/girlsinict#no-back" target="_blank">here</a>.</li> <li><i>Panellist:</i> "Introducing a pro-encryption agenda in Latin America" at AC-LAC with ELAC (2022). Find the information <a href="https://ac-lac.org/en/elac-and-ac-lac-organize-workshop-introducing-a-pro-encryption-agenda-in-latin-america/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Secure Messaging" at the Applied Cryptography course at Radboud University (2022).</li> <li><i>Invited talk:</i> "KEMTLS: Post-quantum TLS without signatures: Lessons-Learnt from PQC Implementations" at ESA Workshop on "Secure Communications for Space Missions in the Post-Quantum Era" (2022).</li> <li><i>Invited talk:</i> "PPM techniques: informal comparison" at the Privacy Enhancements and Assessments Research Group (PEARG) at IETF 114 (2022). Find the information <a href="https://datatracker.ietf.org/meeting/114/materials/agenda-114-pearg-00" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Post-Quantum NIST Process" at the Crypto Forum Research Group (CFRG) at IETF114 (2022). Find the information <a href="https://datatracker.ietf.org/meeting/114/materials/agenda-114-cfrg-04" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "NIST PQC Announcement " at the Transport Layer Security Group (TLS) at IETF114 (2022). Find the information <a href="https://datatracker.ietf.org/meeting/114/materials/agenda-114-tls-03" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "TLS and post-quantum" at Summer School in Post-Quantum Cryptography (2022). Find the information <a href="http://pqcsummerschool2022.inf.elte.hu/index.php/programme/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Post-quantum cryptography" at Computer Webinar Series at Amirkabir University (2022). Find the information <a href="https://www.linkedin.com/company/computer-webinar-series/?originalSubdomain=ir" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Private Browsing" at OpenLabEC (2022). Find the information <a href="https://t.co/vaQppGNRXz" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Anonymous Tokens" at TPAC at W3C (2023). Find the information <a href="https://github.com/antifraudcg/meetings/blob/main/tpac/2022/tpac-2022.md" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Practically-exploitable vulnerabilities in Matrix" at the Privacy Enhancements and Assessments Research Group (PEARG) at IETF 115 (2022). Find the information <a href="https://datatracker.ietf.org/meeting/115/session/pearg" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Methodology to classify IPV aided by digital tools" at the Human Rights and Protocols Considerations Group (HRPC) at IETF 115 (2022). Find the information <a href="https://datatracker.ietf.org/meeting/115/session/hrpc" target="_blank">here</a></li> <li><i>Invited talk:</i> "Practical Cryptography" at the University of Bristol.</li> <li><i>Invited talk:</i> "Latin America and Cryptography" at "Beyond the Usual Suspects: A Workshop on Latin American Cyber Security", Royal Holloway, University of London (2023). Find the information <a href="https://static1.squarespace.com/static/63ecbb167597522082d99465/t/63ff717be247e82ed6808a43/1677685117992/DSLA+03%3A23-+Beyond+the+Usual+Suspects.pdf" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Practically-exploitable vulnerabilities in Matrix" at Blackhat Europe (2023) Find the information <a href="https://www.blackhat.com/eu-22/briefings/schedule/#practically-exploitable-cryptographic--vulnerabilities-in-matrix-29883" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "FrodoPIR: Simple, Scalable, Single-Server Private Information Retrieval" at Chalmers University of Technology (2023). Find the information <a href="https://www.cse.chalmers.se/research/group/security/event/2023/2023-03-02-sofia/" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Designing cryptography for small organizations and projects" at Real World Crypto (2023). Joint submission with Alex Davidson and Peter Snyder. Find the information <a href="https://rwc.iacr.org/2023/program.php" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Report from Real World Crypto (RWC) 2023" at Security Area Open Meeting (SAAG) at IETF116 (2023). Find the information <a href="https://datatracker.ietf.org/meeting/116/session/saag/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "POPLAR/STAR measurements" at PPM WG at IETF 116 (2023). Find the information <a href="https://datatracker.ietf.org/meeting/116/session/ppm/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Failures of security/privacy in practice" at University of Twente (2023).</li> <li><i>Panel:</i> Panellist at CrossFyre (2023). Find the information <a href="https://sites.google.com/view/crossfyre2023/program?authuser=0" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Practically-exploitable Cryptographic Vulnerabilities in Matrix" at NOVA School of Science and Technology at Lisbon, Portugal (2023). Find the information <a href="https://www.di.fct.unl.pt/eventos/2023/03/practically-exploitable-cryptographic-vulnerabilities-matrix-sofia-celi-brave-software-inc" target="_blank">here</a>.</li> <li><i>Moderator:</i> Moderator at CENTR Jamboree 2023 in the panel "Research Initiatives to Assess the Impact of Post Quantum Cryptography on DNS" (2023). Find the information <a href="https://www.centr.org/events/upcoming-events.html" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Private Information Retrieval: from theory to practice" at 14º Coloquio nacional de códigos, criptografía y áreas relacionadas (2023). Find the information <a href="https://sites.google.com/view/xivcnccar/inicio?authuser=0" target="_blank">here</a>.</li> <li><i>Invited talk:</i> Exploring the impact of PQC on Cryptographic Key Management at CryptoVillage at DEFCON (2023).</li> <li><i>Invited talk:</i> Friendship and Research at RISE: Research Insights and Stories for Enlightenment, co-located with CRYPTO (2023). Couldn't attend due to family tragedy. Find the information <a href="https://ewcacrypto2023.github.io/program.html" target="_blank">here</a>.</li> <li><i>Panel:</i> Panellist at 2nd Oxford Post-quantum Cryptography Workshop at University of Oxford (2023). Find the information <a href="https://www.maths.ox.ac.uk/events/conferences/oxford-post-quantum-cryptography-workshop-2023" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Introduction to Cryptography" at INCACrypto (2023). Find the information <a href="https://incacrypto.org/2023/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Intimate Partner Violence Considerations in design of technology" at REPHRAIN from the University of Bristol (2023).</li> <li><i>Invited talk:</i> "MAYO and multivariate" at University of Bristol (2023).</li> <li><i>Invited talk:</i> "MAYO and multivariate" at TII CRC Seminar Series (2023).</li> <li><i>Panel:</i> Panellist at 'For Whom and by Whom? Achieving Locally Sustainable Impact through Digital Security Capacity Building' workshop. Find the information <a href="https://pure.royalholloway.ac.uk/ws/portalfiles/portal/60857081/Workshop_Proposal_For_Whom_and_by_Whom_Achieving_Locally_Sustainable_Impact_through_Digital_Security_Capacity_Building.pdf" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Sigma and proof of knowledge protocols: state, limitations and future" at Cryptography and Related Fields at the AMS Joint Mathematics Meetings: AMS Special Session on Cryptography and Related Fields (2024). Find the information <a href="https://www.jointmathematicsmeetings.org/meetings/national/jmm2024/2300_program_ss86.html#title" target="_blank">here</a>.<i>Cancelled due to sickness</i>.</li> <li><i>Invited talk:</i> "MAYO and multivariate" at Seminario de Criptografía Post-Quántica from Latam (2024).</li> <li><i>Invited talk:</i> "DiStefano: Decentralized Infrastructure for Sharing Trusted Encrypted Facts and Nothing More Private and Efficient Commitments for TLS-encrypted Data" at Shandong University (2024).</li> <li><i>Invited talk:</i> "Designing cryptography/systems for the people" at the University of Bristol (2024).</li> <li><i>Invited talk:</i> "Human rights in the technology we chose to standardize" at RECAP workshop (2024). Find the information <a href="https://recapworkshop.online/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Criptolatino: the community of Latin-American cryptographers" at RECAP workshop (2024). Find the information <a href="https://recapworkshop.online/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "PIR: Recent Developments and Advancements" at 'AB+ — Attributes and Blindness' workshop at Eurocrypt (2024). Find the information <a href="https://abplusec.github.io/" target="_blank">here</a>.</li> <li><i>Contributed talk:</i> "Practical PIR for Real Databases" at 'CAW — Cryptographic Applications Workshop' workshop at Eurocrypt (2024). Find the information <a href="https://caw.cryptanalysis.fun/" target="_blank">here</a>.</li> <li><i>Panel:</i> Panellist at "Panel on standarisation" at 'CAW — Cryptographic Applications Workshop' workshop at Eurocrypt (2024). Find the information <a href="https://caw.cryptanalysis.fun/" target="_blank">here</a>.</li> <li><i>Group:</i> Organiser and mentor at 'Women in Cryptography and Allies' and mentorship lunch workshop at Eurocrypt (2024). Find the information <a href="https://eurocrypt.iacr.org/2024/program.php" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Private Information Retrieval: are we close to make it practical?" at Summer School in Croatia (2024). Find the information <a href="https://summerschool-croatia.cs.ru.nl/2024/#events-schedule" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Private Information Retrieval and Lattices: Advancements and Future Directions" at "New Trends in Post-Quantum Cryptography" at Oxford University (2024). Find the information <a href="https://newtpqc.org/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "DiStefano: Decentralized Infrastructure for Sharing Trusted Encrypted Facts and Nothing More Private and Efficient Commitments for TLS-encrypted Data" at the Anti-Fraud group at W3C (2024).</li> <li><i>Invited talk:</i> "Practical PIR for Real Databases" at Private Information Retrieval Systems workshop co-located with PETS (2024). Find the information <a href="https://github.com/private-retrieval/wip" target="_blank">here</a>.</li> <li><i>Panel:</i> Panellist at GHTC Glowing Hot Topics in Cryptography co-located with CRYPTO (2024). Find the information <a href="https://ghtcworkshop.tii.ae/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "The future of cryptography" at Reunión Española de Criptografía y Seguridad de la Información (RECSI) (2024). Find the information <a href="https://congresos.unileon.es/recsi2024/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Chalamet PIR: Practical Keyword-based PIR" at Berkeley University (2024).</li> <li><i>Invited talk:</i> "Chalamet PIR: Practical Keyword-based PIR" at PEARG at IETF121 (2024). Find the information <a href="https://datatracker.ietf.org/meeting/121/agenda" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "MAYO: Practical Signatures and more" at Portugal Crypto day (2024). Find the information <a href="https://cryptoday.pt/" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "MAYO: Practical Post-Quantum Signatures and Advanced Constructions" at Cryptography and Related Fields at the 2025 AMS Joint Mathematics Meetings: AMS Special Session on Cryptography and Related Fields (2025). Find the information <a href="https://jointmathematicsmeetings.org/meetings/national/jmm2025/2314_program_ss36.html" target="_blank">here</a>.</li> <li><i>Invited talk:</i> "Attestations over TLS 1.3 and ZKP" at Microsoft Research (2025).</li> <li><i>Invited talk:</i> "Attestations over TLS 1.3 and ZKP" at EPFL (2025).</li> <li><i>Invited talk:</i> "Building Bridges and Schemes: The Story of MAYO and a Thriving Team" at Women+ In IC at EPFL (2025).</li> <li><i>Invited talk:</i> "ChalametPIR" at Ethereum Foundation's Learn and Share.</li> <li><i>Keynote:</i> "PIR, Foundations and Foundations, Frontiers, and Future Directions for Search and Recommendation Systems" at IMPACT, co-located with NDSS 2025. Find the information <a href="https://www.ndss-symposium.org/ndss2025/co-located-events/impact/" target="_blank">here</a>.</li> <li><i>Invited Talk:</i> "PIR, Foundations and Foundations, Frontiers, and Future Directions for Search and Recommendation Systems" at AlgoCRYPT Seminar at JPMorgan.</li> <li><i>Invited Talk:</i> TLS Notarization in browsers at ZKProof. Find the information <a href="https://zkproof.org/events/zkproof-7-sofia/" target="_blank">here</a>.</li></li> <li><strong>Upcoming:</strong> Masterclass at Universidad UTE.</li> <li><strong>Upcoming:</strong> TBA at Chalmers University.</li> <li><strong>Upcoming:</strong> TBA at University of Michigan.</li> <li><strong>Upcoming:</strong> TBA at crypt@b-it.</li> <li><strong>Upcoming:</strong> TBA at Escuela CIMPA.</li> <li><strong>Upcoming:</strong> <i>Invited Talk:</i> TBA at Cypherpunk Congress.</li> </ul> <br> <a class="none" id="news"><h2 class="divider">policy talks/work</h2></a> <p>I've been invited to provide input to policies or to policy-related organisms (talks from new to old):</p> <ul class="centered-list"> <li><i>Talk:</i> TBA at the "Quantum Standardization: Shaping Global Policies, Women in Quantum Spotlight" by International Telecommunication Union (ITU).</li> <li><i>Letter:</i> Singed the "Joint Letter on the UK Government’s use of Investigatory Powers Act to attack End-to-End Encryption" by the Global Encryption Coallition. Read it <a href="https://www.globalencryption.org/2025/02/joint-letter-on-the-uk-governments-use-of-investigatory-powers-act-to-attack-end-to-end-encryption/" target="_blank">here</a>. (2025).</li> <li><i>Panel:</i> Panellist at the <a href="https://www.sigsac.org/ccs/CCS2024/attending/DEI.html" target="_blank">DEI (Diversity, Equity, and Inclusion) Workshop</a> co-located with the 2024 ACM Conference on Computer and Communications Security (CCS) (2024).</li> <li><i>Panel:</i> Panellist at the <a href="https://www.apc.org/en/pubs/gender-approaches-cybersecurity-integrating-policy-research-and-technical-standards" target="_blank">"Online Roundtable: Gender Approaches to Cybersecurity"</a> by The Association for Progressive Communications (APC) (2024).</li> <li><i>Panel:</i> Panellist at the <a href="https://www.gp-digital.org/publication/regional-roundtable-briefing-internet-fragmentation-and-human-rights-in-europe/" target="_blank">"Regional Roundtable: Internet Fragmentation and Human Rights in Europe"</a> roundtable (2023-2024) from Global Partners Digital.</li> <li><i>Panel:</i> Panellist at <a href="https://www.ecfr.eu/" target="_blank">European Council on Foreign Relations (ECFR) 2023</a> virtual round table (2023): Which technology standards will shape tomorrow's multipolar world?.</li> <li><i>Expert Consultation:</i> Discussing the relationship between human rights and technical standard-setting at the <a href="https://www.ohchr.org/en/events/events/2023/ohchr-consultation-human-rights-and-technical-standard-setting" target="_blank">UN Human Rights Council</a> (2023).</li> <li><i>Panel</i>: Panelist at the <a href="https://digital-strategy.ec.europa.eu/en/events/high-level-multi-stakeholder-event-future-internet" target="_blank">"High-level multi-stakeholder event on the Future of the Internet"</a> by the European Commission in collaboration with the Czech Presidency to the Council of the EU (2022).</li> </ul> <br> <a class="none" id="news"><h2 class="divider">news</h2></a> <p>Happy news that help me with my imposter syndrome:</p> <ul class="centered-list"> <li>Nominated to be SEC AD at IETF. See <a href="https://datatracker.ietf.org/nomcom/2023/nominate" target="_blank">here</a>. Thank you whoever nominated me ;). Rescinded application.</li> <li>Thank you so much, Leah Namisa Rosenbloom, for acknowledging me in the amazing work <a href="https://eprint.iacr.org/2024/1602.pdf" taget="_blank">'Cryptography and Collective Power'</a>. This is a much needed work.</li> </ul> </div> </div> </article> </div> </div> </div> <footer class="site-footer"> <div class="wrapper"> <div class="footer-col-wrapper"> <div class="footer-col footer-col-1"> <h1>contact me</h1> <p>Want to know more? 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