CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '9136c8f1ca86fd83',cH: 'a8Inh7GxtjhvTyvjtcV8iOQubxmglu5de3whPOYxQ_M-1739805872-1.2.1.1-ixLD0XBstbsvf7BV9U.vNSMvWwUx7qCO3YmEkWYzqz6qe_GPz_pG6.CyX6kWBAhe',cUPMDTk: "\/abstracts\/search?q=speech%20encryption&__cf_chl_tk=3HiSsfADtpXa75E8mxXYoimcjHWhFPXR9uhEfLXj9Vo-1739805872-1.0.1.1-god0nOOYYLnV1DqoldXHpzxoJcwUGWa7zJpCBz1at4M",cFPWv: 'g',cITimeS: '1739805872',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=speech%20encryption&__cf_chl_f_tk=3HiSsfADtpXa75E8mxXYoimcjHWhFPXR9uhEfLXj9Vo-1739805872-1.0.1.1-god0nOOYYLnV1DqoldXHpzxoJcwUGWa7zJpCBz1at4M",md: "AityVa8S02nlOtPAnYl8D60DLCppLD7BGZV6y4Ly6UE-1739805872-1.2.1.1-XPHkq_Brxfvsd.HWtyJwY0aK6G7lazMI3uANz6NwO3COoHbAGtM2d5fSRo2iEXia4COY0gqmhkOpBAJzOWwHX__7cdVNqs9Frhqg54ZOVz6KPC9zRY.9gCw29d2EfDIXLZdZTNu75tb4KSi5TtLcucbdf7eAcrki4xNvjbwdR6C.I2cwLp2oyujN.9992tysToXQ3K.6onBU5SPbKz10fKKnifjb2bVpqom85u9dIYGrxVpPtfUsWEXhQOW.7KeLomgsOle0NACf2vf2tecdZUc4PedE5LOzvI.KfSv7AxhshYaqd64yMmv0O6ZYA2b9ux8KQrYxFuTMa2gxeNPJw3jRvmR7czsIqKyr2fBj7UCR38zUFaSMSmtSaWwxH2XQnq4CfotNiiioEbI3z.y6kqfiP3C4cl9gPpusPwmclsdHj3qYz.eJy0Zd3qwHMI0jjUgxQn8r9rXGiC3AKrNhTZzQx9cg_saU71fW_t7evpVRUpF3u5ltleCRlpJU7ATWCl.x9ovatU8Nnf2vTp6gDqYb6ZVaNL5mMYx87F0yqGCoTM.qg_CB_MatlGMTAh_Qikw7L_6SgRMUTmfSAlNUFDcWMBYw6aZFVAjaj8xONu8p26qiXx2FPcVjP4nc7rr23vg06k1YRHobTiAFKV2IqaPNT50c9NTnjTIbzy2EbNn9ICcLpqiKqijZnJw6KEn7lFVufIrYh5snsOua8U.77oDyb6afsU8oF9w.aCWkDYN9GanD4M1DE3XghEFn5izbJKPcTwJ.wuhZsbQiBK0GTDyvOAh5zVp7Ki2Miza4KO43fNh9ZYmRG5OBwApn9cPmCqSBUcLSujads0ueRe_R4Y05Dc7yl7v2mNWlSuJtTgHRCdcjP4tnrvzONgF0GpvonksCz2Lw1zKMlxeODrCzVa6aoFl6wNMz2XSqf0ehH2WDe0LDeu79JOL.H98oV5YatI0DHrqXWDbRYBN5Md.Lqg79hjztPVDIQeHRB7X_vNoWvLDlBjPYFIcZrU220IVrLxd_5U3BZgMfgWiMbawTKVd.o8ogsoJ8jb8W5ISMFbbEmhAcCFY7r8xmm.ATBLJfIpUeMBYr0eXLiTRxn1JdQPZSnv2XygRMZ.O5B1GUDGwGqlsBgLi3MlkBEno7O3qfl_2w0RMtXrnnIOS0RgmaMODtFMmJ1ga5GkFNsrdvupk0jHalig13Lmlon36KhoBeUfz7k9ziznNp8P99HiCKHSqYU3NM5k2OQcnuJqb6B8IAfSxJI9Eo6VitEAEIK_B1en_jwax_n7E5HF6vaRSlnzFXmR1_DA0TT2.B7KZf63TPf6E1GOfUyfAzfDKSsCfpOzrF_L1ZGMTOnnq3o7FVEThd1w0SJW.asnvdlzqmCgmVv.K2_KOxfTE02KW8RYMckmGhCplkvhKNAdW.ZxOEizBoTndQmhpbB543ECSQx6tGNIUGBCtXgpvGG6KXrdc9Z_.RUwAU70UvVCeoq7e9WozjzbMRa8esbpyEoldVgAlS5Gtih3xgzolPYhNEztvPO._ra4ycKkfZ84a1TO4zgvk_XNZnY.MGTh4Jc9QXvcUk3oBzKYu2vq8hPP.ogLcrCIUJ99_D3QW4AfYSkUmbHocctkG76fEbzCTSEmGJwmcIYcUNDu0cFW1SdOxNGh1kemoyZQLIKBAQtMcDLy.vD4HCFnyVUwF4CohZmwIZ_D2lvZC6wj20VE4ofyk2VvlCgXkh9Ho.xU9zSsGhA6YsnlbTjF3K9.xnQ_9f4gAhWXje35P68MklEXebCvMNlf59Ql11jVbSVeUwx_p66ErVcq52MPhJeWfmQ5j0e9OI7WsMD4XDkuZRN0Dr8G3ZGGSoH9lY3K3fl8w8c9XDPMq6L2105CZtEWNzI0kZt5IhbqXz2fHifD4YdAmAYYDixBjO7I0X3ffPKqH0_NS5tCwrIikdFLxmHWCWUd7pHmIm0gU",mdrd: "dIIM9ClahUUlant3MYwDwv6S0c5mpp8uO9ZKAgozJ1A-1739805872-1.2.1.1-UPzaoZlh1LMS2ScBxbxT802KDOYOkXfyvN_GF6xDDiei6zAstvA_juBaybx5BZLEtZ7Jgmo3XEi12yu6T9TwEp231d3w6Vx.cb2M05f1emwTv6M6MCLiQIZH8MVNC8u5OmlfQ60ngE8.WrOpqW8.bDucykzV7NGVuWze.HNqhqaO5IsGeO_Ja.yorqfKubID8oCI6DdYro_JJ28al34lu__JGjddsW.OqHACuLw2A3ME0IYABBsJOYXXWtQExhdqHXqKe9BJYE7slAFONHJ5SFswgK3jeIznAuQ6kwA0QaxAX9QQ8G8BEtPMGsDJJ9IZoX.CS3x_X.JJUxwRR2v0Eaot0LvV9z9ebGVk4oqZ3YP2IQXdJsVgE5ICu.4T7iMULWLdbK0RmWmWNamxrHmCuu58lN70dmqj2ngsGsSKpeMOnGgGA9NmcC1PEtFDDMWdjQQ9hJ_gAyYR6i9s4r5Uu0VKGol.6QPoinPJfoNXo4iDFDFqpAn0fZvykMK9bw.mi7QuqhyzYbMdlf1XuN_kBCuY0CDPcdcho0J.QQPa43vAlYMWH8AF6xuQcl24KRDIBQN.Uorhjdyqo29HIOqy0wUejx5NmbwAuF1NydGHLCGTLwoejIqcPm.YUDftqfB8w_aRqjrnMJ5NsDrNTfTldorY6Abl.gGO_to7A2zOQ6OvTOVCUB2oJgR7xZnPFAG4Dm6rV0LYHPAF2Abgvxsbg2aQx5ePuQSP69NsLShzp5IiP6PP3fC_8Z.2OsSMOnEq5ieUxDE8ZWhGmhNSNNZqB1BuYNoPFK1ZyqCa7RKkm6j3359TONA1IU_xLJNN8ZbmaXQTFuk3yBGow5o_3a7drWKgVHhCuhvQ7VI.eRdGLOiGHh0vwU8IoTRvb.CSPh2riHr3LOSVNZZi.O1I7unHr3vREW6J9PG1nTbTsmI0c0EXjWtveD0laQVYB_arXayi0zbFS5D0rGC1jYyE.ovpO6mdiPNo7ZBAOp.acIgH7Hz9sPQ0Cv5cmlptHYqjuROwN6tJZcawH79813EXGngmCl577K9Hqp93GNs5cvG3FDonO4aBSgl1duZXPxj3f0qe1T._oxfGSb4qK4_RxPQKftlB58eRQatauD.lMg1PuB.eBjc6GCi17KKSwZPTUl1TKgLfSYowhdJff60aMBpLeeB5W1f2960SebX7L6P5N58vKlH3wOTOl_mUVxDd_yGBjL_BUITdsLAi3k4SjEGwSTj4nQC6R.yKmZmQ.eHqHc8WVJUSp8EoMDf9k3s_G0DdURZFIGZXMUMgGssL_IDGbnW7pplW6Xl2dI6wDFQlqC_4or8DPoJUuVKiCSiN7DC3QbsdrxqC43VHPflx1rJxXj_x_ChgUKeuwd8A_Crkn4jGdSuUHiNYZTrR6HWRuscb4m0sPZx.OA3YyFN6ZhTso8PcHSD2T4E10AhETpSWYeMzVMA9TVEVEFQfHQsIBYTq5eT8k83FEvQE989LOdfsQfAwaXEYshKrwJ0fHslHi91B7ZFmwP8WALmD2B.eWMVBWwio_kP5Scw_J_xh_5jxup7CTLfWFU3nPQpIdE5ZmlWovcHBg5khNX2gn9K6ZS0sBbKC1eDcFgLR91W4igj5kxrHsUhWsiigCHNoLj0OcfA3HIF.qjU1wxVbdrciBhy4.dMZqOHMBijxWVkc4tHoJSdkTdVcHMnOa0Si7aK_86M.pcYAwh2TeJKf4fVj6J8uGXinU15TIQc2mwM.1Jqu4U.tjn0tKnKRn6b07PsNs_RTRS7yNWcNrqZ84w1L.S95eJHAtABpdkqhAsMrsvoc5JMRwIk.KLjYLU33wjhCLQvdORju.8ioVTd86tQeXtfT2z4v8mLZzOWzjufX3YnF6oTnqBPcHxA_vAfJEHNn1hfcEwe.kkSsUO8eQUDAmJ.MIfu4lxZnVNEJyn8aTJFzC5vQ5YyGOkoKlwKczFe8wvtPOz4.q9XGCDR_ZeOZR1NM..vsn_6QBVyvi_8SX5zgzg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9136c8f1ca86fd83';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/abstracts\/search?q=speech%20encryption&__cf_chl_rt_tk=3HiSsfADtpXa75E8mxXYoimcjHWhFPXR9uhEfLXj9Vo-1739805872-1.0.1.1-god0nOOYYLnV1DqoldXHpzxoJcwUGWa7zJpCBz1at4M" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>