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Wi-Fi Protected Access - Viquipèdia, l'enciclopèdia lliure

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class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Modificar la dimension, la largor e la color del tèxte." > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparença" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance 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href="/w/index.php?title=Especial:Crea_compte&amp;returnto=Wi-Fi+Protected+Access" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori" class=""><span>Crea un compte</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Registre_i_entrada&amp;returnto=Wi-Fi+Protected+Access" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o" class=""><span>Inicia la sessió</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Més opcions" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Eines personals" > <label id="vector-user-links-dropdown-label" 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[n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"><!-- CentralNotice --></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contingut" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inici</div> </a> </li> <li id="toc-Història" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Història"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Història</span> </div> </a> <ul id="toc-Història-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Seguretat,_Atacs_WPA_TKIP" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Seguretat,_Atacs_WPA_TKIP"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Seguretat, Atacs WPA TKIP</span> </div> </a> <ul id="toc-Seguretat,_Atacs_WPA_TKIP-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-WPA2" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#WPA2"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>WPA2</span> </div> </a> <ul id="toc-WPA2-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Seguretat_Atacs_WPA2" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Seguretat_Atacs_WPA2"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Seguretat Atacs WPA2</span> </div> </a> <ul id="toc-Seguretat_Atacs_WPA2-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Vegeu_també" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Vegeu_també"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Vegeu també</span> </div> </a> <ul id="toc-Vegeu_també-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Enllaços_externs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Enllaços_externs"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Enllaços externs</span> </div> </a> <ul id="toc-Enllaços_externs-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contingut" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Taula de continguts" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Commuta la taula de continguts." > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Commuta la taula de continguts.</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Wi-Fi Protected Access</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vés a un article en una altra llengua. Disponible en 34 llengües" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-34" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">34 llengües</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - afrikaans" lang="af" hreflang="af" data-title="Wi-Fi Protected Access" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%88%D8%B5%D9%88%D9%84_%D9%85%D8%AD%D9%85%D9%8A_%D9%84%D9%84%D8%B4%D8%A8%D9%83%D8%A7%D8%AA_%D8%A7%D9%84%D9%84%D8%A7%D8%B3%D9%84%D9%83%D9%8A%D8%A9" title="وصول محمي للشبكات اللاسلكية - àrab" lang="ar" hreflang="ar" data-title="وصول محمي للشبكات اللاسلكية" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/T%C9%99hl%C3%BCk%C9%99siz_Wi-Fi_giri%C5%9Fi" title="Təhlükəsiz Wi-Fi girişi - azerbaidjanès" lang="az" hreflang="az" data-title="Təhlükəsiz Wi-Fi girişi" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaidjanès" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/WPA" title="WPA - bosnià" lang="bs" hreflang="bs" data-title="WPA" data-language-autonym="Bosanski" data-language-local-name="bosnià" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - txec" lang="cs" hreflang="cs" data-title="Wi-Fi Protected Access" data-language-autonym="Čeština" data-language-local-name="txec" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - alemany" lang="de" hreflang="de" data-title="Wi-Fi Protected Access" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - anglès" lang="en" hreflang="en" data-title="Wi-Fi Protected Access" data-language-autonym="English" data-language-local-name="anglès" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - esperanto" lang="eo" hreflang="eo" data-title="Wi-Fi Protected Access" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - espanyol" lang="es" hreflang="es" data-title="Wi-Fi Protected Access" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/WPA" title="WPA - estonià" lang="et" hreflang="et" data-title="WPA" data-language-autonym="Eesti" data-language-local-name="estonià" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/WPA" title="WPA - basc" lang="eu" hreflang="eu" data-title="WPA" data-language-autonym="Euskara" data-language-local-name="basc" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AF%D8%B3%D8%AA%D8%B1%D8%B3%DB%8C_%D9%85%D8%AD%D8%A7%D9%81%D8%B8%D8%AA_%D8%B4%D8%AF%D9%87_%D8%A7%D8%B2_%D9%88%D8%A7%DB%8C-%D9%81%D8%A7%DB%8C" title="دسترسی محافظت شده از وای-فای - persa" lang="fa" hreflang="fa" data-title="دسترسی محافظت شده از وای-فای" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/WPA_(salausprotokolla)" title="WPA (salausprotokolla) - finès" lang="fi" hreflang="fi" data-title="WPA (salausprotokolla)" data-language-autonym="Suomi" data-language-local-name="finès" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - francès" lang="fr" hreflang="fr" data-title="Wi-Fi Protected Access" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/WPA" title="WPA - hebreu" lang="he" hreflang="he" data-title="WPA" data-language-autonym="עברית" data-language-local-name="hebreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/WPA" title="WPA - croat" lang="hr" hreflang="hr" data-title="WPA" data-language-autonym="Hrvatski" data-language-local-name="croat" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/WPA" title="WPA - hongarès" lang="hu" hreflang="hu" data-title="WPA" data-language-autonym="Magyar" data-language-local-name="hongarès" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Akses_Perlindungan_Wi-Fi" title="Akses Perlindungan Wi-Fi - indonesi" lang="id" hreflang="id" data-title="Akses Perlindungan Wi-Fi" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesi" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - italià" lang="it" hreflang="it" data-title="Wi-Fi Protected Access" data-language-autonym="Italiano" data-language-local-name="italià" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - japonès" lang="ja" hreflang="ja" data-title="Wi-Fi Protected Access" data-language-autonym="日本語" data-language-local-name="japonès" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%99%80%EC%9D%B4%ED%8C%8C%EC%9D%B4_%EB%B3%B4%ED%98%B8_%EC%A0%91%EC%86%8D" title="와이파이 보호 접속 - coreà" lang="ko" hreflang="ko" data-title="와이파이 보호 접속" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/WPA" title="WPA - letó" lang="lv" hreflang="lv" data-title="WPA" data-language-autonym="Latviešu" data-language-local-name="letó" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - neerlandès" lang="nl" hreflang="nl" data-title="Wi-Fi Protected Access" data-language-autonym="Nederlands" data-language-local-name="neerlandès" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - noruec bokmål" lang="nb" hreflang="nb" data-title="Wi-Fi Protected Access" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - polonès" lang="pl" hreflang="pl" data-title="Wi-Fi Protected Access" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/WPA" title="WPA - rus" lang="ru" hreflang="ru" data-title="WPA" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/WPA" title="WPA - serbocroat" lang="sh" hreflang="sh" data-title="WPA" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbocroat" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - Simple English" lang="en-simple" hreflang="en-simple" data-title="Wi-Fi Protected Access" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/WPA" title="WPA - serbi" lang="sr" hreflang="sr" data-title="WPA" data-language-autonym="Српски / srpski" data-language-local-name="serbi" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/WPA" title="WPA - suec" lang="sv" hreflang="sv" data-title="WPA" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - turc" lang="tr" hreflang="tr" data-title="Wi-Fi Protected Access" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Wi-Fi_Protected_Access" title="Wi-Fi Protected Access - ucraïnès" lang="uk" hreflang="uk" data-title="Wi-Fi Protected Access" data-language-autonym="Українська" data-language-local-name="ucraïnès" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/WPA" title="WPA - vietnamita" lang="vi" hreflang="vi" data-title="WPA" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/WPA" title="WPA - xinès" lang="zh" hreflang="zh" data-title="WPA" data-language-autonym="中文" data-language-local-name="xinès" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q272165#sitelinks-wikipedia" title="Modificau enllaços interlingües" class="wbc-editpage">Modifica els enllaços</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Espais de noms"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Wi-Fi_Protected_Access" title="Vegeu el contingut de la pàgina [c]" accesskey="c"><span>Pàgina</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Discussi%C3%B3:Wi-Fi_Protected_Access&amp;action=edit&amp;redlink=1" rel="discussion" class="new" title="Discussió sobre el contingut d&#039;aquesta pàgina (encara no existeix) [t]" accesskey="t"><span>Discussió</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Canvia la variant de llengua" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">català</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Vistes"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Wi-Fi_Protected_Access"><span>Mostra</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit" title="Modifica el codi font d&#039;aquesta pàgina [e]" accesskey="e"><span>Modifica</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=history" title="Versions antigues d&#039;aquesta pàgina [h]" accesskey="h"><span>Mostra l&#039;historial</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Eines de la pàgina"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Eines" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Eines</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Eines</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">amaga</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet 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class="mw-list-item"><a href="/wiki/Especial:Enlla%C3%A7os/Wi-Fi_Protected_Access" title="Una llista de totes les pàgines wiki que enllacen amb aquesta [j]" accesskey="j"><span>Què hi enllaça</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Especial:Seguiment/Wi-Fi_Protected_Access" rel="nofollow" title="Canvis recents a pàgines enllaçades des d&#039;aquesta pàgina [k]" accesskey="k"><span>Canvis relacionats</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;oldid=32114385" title="Enllaç permanent a aquesta revisió de la pàgina"><span>Enllaç permanent</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=info" title="Més informació sobre aquesta pàgina"><span>Informació de la pàgina</span></a></li><li id="t-cite" class="mw-list-item"><a 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class="vector-pinnable-header-label">Aparença</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">amaga</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">De la Viquipèdia, l&#039;enciclopèdia lliure</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ca" dir="ltr"><p><b>WPA</b> (<a href="/wiki/Acr%C3%B2nim" title="Acrònim">acrònim</a> de <i>Wi-Fi Protected Access</i> - 1995 - Accés Protegit Wi-Fi) és un sistema per a protegir les xarxes sense fils (<a href="/wiki/Wi-Fi" title="Wi-Fi">Wi-Fi</a>); creat per a corregir les deficiències del sistema previ <a href="/wiki/WEP" class="mw-redirect" title="WEP">WEP</a> (<i>Wired Equivalent Privacy</i> - Privadesa Equivalent a Cablejat). Els investigadors han trobat diverses debilitats en l'algorisme WEP (com la reutilització del vector d'inicialització (IV), que fa possible que mitjançant atacs estadístics es pugui recuperar la clau WEP, entre d'altres). WPA implementa la majoria de l'estàndard IEEE 802.11i, i va ser creat com una mesura intermèdia per a ocupar el lloc de WEP mentre 802.11i era finalitzat. WPA va ser creat per "The Wi-Fi Alliance" (L'Aliança Wi-Fi), veure <a rel="nofollow" class="external free" href="https://www.wi-fi.org/">http://www.wi-fi.org/</a>. </p><p>WPA adopta l'autentificació d'usuaris mitjançant l'ús d'un servidor, on s'emmagatzemen les credencials i contrasenyes dels usuaris de la xarxa. Per no obligar a l'ús d'aquest servidor per al desplegament de xarxes, WPA permet l'autentificació mitjançant clau compartida (<a href="/wiki/Pre-Shared_Key" class="mw-redirect" title="Pre-Shared Key">PSK</a>, Pre-Shared Key), que d'una manera similar al WEP, requereix introduir la mateixa clau en tots els equips de la xarxa. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Història"><span id="Hist.C3.B2ria"></span>Història</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit&amp;section=1" title="Modifica la secció: Història"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>WPA va ser dissenyat per a utilitzar un servidor d'autentificació (normalment un servidor <a href="/wiki/RADIUS" title="RADIUS">RADIUS</a>), que distribueix claus diferents a cada usuari (a través del protocol 802.1x); no obstant això, també es pot utilitzar en una manera menys segura de clau pre-compartida (<b><a href="/wiki/Pre-Shared_Key" class="mw-redirect" title="Pre-Shared Key">PSK</a> - Pre-Shared Key</b>) per a usuaris de casa o petita oficina. La informació és xifrada utilitzant l'algorisme <a href="/wiki/RC4" title="RC4">RC4</a> (a causa que WPA no elimina el procés de xifrat WEP, només ho enforteix), amb una clau de 128 bits i un vector d'inicializació de 48 bits. </p><p>Una de les millores sobre WEP, és la implementació del Protocol d'Integritat de Clau Temporal (<a href="/wiki/TKIP" title="TKIP">TKIP</a> - <i>Temporal Key Integrity Protocol</i>), que canvia claus dinàmicament a mesura que el sistema és utilitzat. Quan això es combina amb un vector d'inicializació (IV) molt més gran, evita els atacs de recuperació de clau (atacs estadístics) als quals és susceptible WEP. </p><p>Addicionalment a l'autenticació i xifrat, WPA també millora la integritat de la informació xifrada. La comprovació de redundància cíclica (<a href="/wiki/CRC" class="mw-redirect" title="CRC">CRC</a> - <i>Cyclic Redundancy Check</i>) utilitzat en WEP és insegur, ja que és possible alterar la informació i actualitzar la CRC del missatge sense conèixer la clau WEP. WPA implementa un codi d'integritat del missatge (MIC - <i>Message Integrity Code</i>), també conegut com a "Michael". A més, WPA inclou protecció contra atacs de "repetició" (replay attacks), ja que inclou un comptador de trames. </p><p>En incrementar la grandària de les claus, el nombre de claus en ús, i en agregar un sistema de verificació de missatges, WPA fa que l'entrada no autoritzada a xarxes sense fils sigui molt més difícil. L'algorisme Michael va ser el més fort que els dissenyadors de WPA van poder crear, sota la premissa que havia de funcionar en les targetes de xarxa sense fils més velles; no obstant això és susceptible a atacs. Per a limitar aquest risc, els drivers de les estacions es desconnectaran un temps definit pel fabricant, si reben dues col·lisions Michael en menys de 60&#160;segons, podran prendre mesures, com per exemple reenviar les claus o deixar de respondre durant un temps específic. </p> <div class="mw-heading mw-heading2"><h2 id="Seguretat,_Atacs_WPA_TKIP"><span id="Seguretat.2C_Atacs_WPA_TKIP"></span>Seguretat, Atacs WPA TKIP</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit&amp;section=2" title="Modifica la secció: Seguretat, Atacs WPA TKIP"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>TKIP és vulnerable a un atac de recuperació de keystream, això és, seria possible reinjectar tràfic en una xarxa que utilitzés WPA TKIP. Això és possible per diverses causes, algunes d'elles heretades de WEP. Entre les causes, cap destacar l'evasió de les mesures anti-reinjecció de TKIP i se segueix una metodologia similar a la utilitzada en el popular atac CHOP CHOP sobre el protocol WEP. L'evasió de protecció anti reinjecció de TKIP és possible a causa dels diversos canals que s'utilitzen en la manera QoS especificat en l'estàndard <a href="/w/index.php?title=802.11ie&amp;action=edit&amp;redlink=1" class="new" title="802.11ie (encara no existeix)">802.11ie</a>, encara que també existeix la possibilitat d'aplicar-ho en xarxes no QoS. </p> <div class="mw-heading mw-heading2"><h2 id="WPA2">WPA2</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit&amp;section=3" title="Modifica la secció: WPA2"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Una vegada finalitzat el nou estàndard 802.11i es crea el WPA2 basat en aquest. WPA es podria considerar de "migració", mentre que WPA2 és la versió certificada de l'estàndard de la IEEE. </p><p>L'estàndard 802.11i va ser ratificat al juny de <a href="/wiki/2004" title="2004">2004</a>. </p><p>L'aliança <a href="/wiki/Wi-Fi" title="Wi-Fi">Wi-Fi</a> anomena a la versió de clau pre-compartida WPA-Personal i WPA2-Personal, i a la versió amb autenticació 802.1x/EAP com WPA-Enterprise i WPA2-Enterprise. </p><p>Els fabricants van començar a produir la nova generació de punts d'accessos recolzant-se en el protocol WPA2 que utilitza l'algorisme de xifrat AES (Advanced Encryption Standard). Amb aquest algorisme serà possible complir amb els requisits de seguretat del govern dels EUA - FIPS140-2. "WPA2 està idealment pensat per a empreses tant del sector privat com del públic. Els productes que són certificats per a WPA2 li donen als gerents de TI la seguretat que la tecnologia compleix amb estàndards d'interoperativitat" va declarar Frank Hazlik Managing Director de la Wi-Fi Alliance. Si bé parteix de les organitzacions estaven esperant aquesta nova generació de productes basats en AES és important ressaltar que els productes certificats per a WPA segueixen sent segurs d'acord amb el qual s'estableix en l'estàndard 802.11i </p> <div class="mw-heading mw-heading2"><h2 id="Seguretat_Atacs_WPA2">Seguretat Atacs WPA2</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit&amp;section=4" title="Modifica la secció: Seguretat Atacs WPA2"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Tant la versió 1 de WPA, com la denominada versió 2 de WPA, es basen en la transmissió de les autenticacions suportades en l'element d'informació corresponent, en el cas de WPA 1, en el tag propietari de Microsoft, i en el cas de WPA2 en el tag estàndard <a href="/wiki/IEEE_802.11i" title="IEEE 802.11i">802.11i</a> RSN. Durant l'intercanvi d'informació en el procés de connexió RSN, si el client no suporta les autentificacions que especifica l'AP, serà desconnectat podent sofrir d'aquesta manera un atac de denegació de servei (DoS) específic a WPA. </p><p>A més, també existeix la possibilitat de capturar el "4way" handshake que s'intercanvia durant el procés d'autenticació en una xarxa amb seguretat robusta. Les claus pre-compartides PSK (Pre Shared Key) són vulnerables a atacs de diccionari, però no les empresarials, ja que el servidor RADIUS generarà de manera aleatòria dites claus. </p><p>Existeixen projectes lliures que utilitzen GPUs amb llenguatges específics com CUDA per a realitzar atacs de força bruta fins a 100&#160;vegades més ràpid que amb computadors ordinaris. </p> <div class="mw-heading mw-heading2"><h2 id="Vegeu_també"><span id="Vegeu_tamb.C3.A9"></span>Vegeu també</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit&amp;section=5" title="Modifica la secció: Vegeu també"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Pre-Shared_Key" class="mw-redirect" title="Pre-Shared Key">Pre-Shared Key</a></li> <li><a href="/wiki/Wired_Equivalent_Privacy" title="Wired Equivalent Privacy">Wired Equivalent Privacy</a></li> <li><a href="/wiki/Sense_fils" class="mw-redirect" title="Sense fils">Wireless</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Enllaços_externs"><span id="Enlla.C3.A7os_externs"></span>Enllaços externs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wi-Fi_Protected_Access&amp;action=edit&amp;section=6" title="Modifica la secció: Enllaços externs"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://www.wi-fi.org/">Wi-Fi Alliance</a></li> <li><a rel="nofollow" class="external text" href="http://www.ieee802.org/11">IEEE 802.11</a></li> <li><a rel="nofollow" class="external text" href="http://www.manual-wifi.com/crackear-wpa-con-pyrit/">GPU CUDA força bruta WPA</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090831075205/http://www.manual-wifi.com/crackear-wpa-con-pyrit/">Arxivat</a> 2009-08-31 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</li></ul> <!-- NewPP limit report Parsed by mw‐web.eqiad.main‐75687f9f4b‐qvj8t Cached time: 20250322044134 Cache expiry: 2592000 Reduced expiry: false Complications: [show‐toc] CPU time usage: 0.023 seconds Real time usage: 0.030 seconds Preprocessor visited node count: 42/1000000 Post‐expand include size: 414/2097152 bytes Template argument size: 0/2097152 bytes Highest expansion depth: 3/100 Expensive parser function count: 0/500 Unstrip recursion depth: 0/20 Unstrip post‐expand size: 0/5000000 bytes Lua time usage: 0.003/10.000 seconds Lua memory usage: 632347/52428800 bytes Number of Wikibase entities loaded: 0/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 17.212 1 Plantilla:Webarchive 100.00% 17.212 1 -total --> <!-- Saved in parser cache with key cawiki:pcache:507160:|#|:idhash:canonical and timestamp 20250322044134 and revision id 32114385. 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mw-portlet mw-portlet-sticky-header-toc vector-sticky-header-toc vector-button-flush-left" > <input type="checkbox" id="vector-sticky-header-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-sticky-header-toc" class="vector-dropdown-checkbox " aria-label="Commuta la taula de continguts." > <label id="vector-sticky-header-toc-label" for="vector-sticky-header-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Commuta la taula de continguts.</span> </label> <div class="vector-dropdown-content"> <div id="vector-sticky-header-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div class="vector-sticky-header-context-bar-primary" aria-hidden="true" ><span class="mw-page-title-main">Wi-Fi Protected Access</span></div> </div> </div> <div class="vector-sticky-header-end" aria-hidden="true"> <div class="vector-sticky-header-icons"> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-talk-sticky-header" tabindex="-1" data-event-name="talk-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbles mw-ui-icon-wikimedia-speechBubbles"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-subject-sticky-header" tabindex="-1" data-event-name="subject-sticky-header"><span class="vector-icon mw-ui-icon-article mw-ui-icon-wikimedia-article"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-history-sticky-header" tabindex="-1" data-event-name="history-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-history mw-ui-icon-wikimedia-wikimedia-history"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only mw-watchlink" id="ca-watchstar-sticky-header" tabindex="-1" data-event-name="watch-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-star mw-ui-icon-wikimedia-wikimedia-star"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-edit-sticky-header" tabindex="-1" data-event-name="wikitext-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-wikiText mw-ui-icon-wikimedia-wikimedia-wikiText"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-ve-edit-sticky-header" tabindex="-1" data-event-name="ve-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-edit mw-ui-icon-wikimedia-wikimedia-edit"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-viewsource-sticky-header" tabindex="-1" data-event-name="ve-edit-protected-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-editLock mw-ui-icon-wikimedia-wikimedia-editLock"></span> <span></span> </a> </div> <div class="vector-sticky-header-buttons"> <button class="cdx-button cdx-button--weight-quiet mw-interlanguage-selector" id="p-lang-btn-sticky-header" tabindex="-1" data-event-name="ui.dropdown-p-lang-btn-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>34 llengües</span> </button> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive" id="ca-addsection-sticky-header" tabindex="-1" data-event-name="addsection-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbleAdd-progressive mw-ui-icon-wikimedia-speechBubbleAdd-progressive"></span> <span>Afegeix un tema</span> </a> </div> <div class="vector-sticky-header-icon-end"> <div class="vector-user-links"> </div> </div> </div> </div> </div> <div class="mw-portlet mw-portlet-dock-bottom emptyPortlet" id="p-dock-bottom"> <ul> </ul> </div> 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