{"id":38261,"date":"2020-02-07T07:30:24","date_gmt":"2020-02-07T06:30:24","guid":{"rendered":"https:\/\/blog.wildix.com\/?p=38261"},"modified":"2020-01-30T15:56:01","modified_gmt":"2020-01-30T14:56:01","slug":"transmission-securisee-des-medias","status":"publish","type":"post","link":"https:\/\/blog.wildix.com\/fr\/transmission-securisee-des-medias\/","title":{"rendered":"Transmission s\u00e9curis\u00e9e des m\u00e9dias"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text]<img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-22341 size-large\" src=\"https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission-1024x683.jpg\" alt=\"\" width=\"625\" height=\"417\" srcset=\"https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission-1024x683.jpg 1024w, https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission-300x200.jpg 300w, https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission-768x512.jpg 768w, https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission-624x416.jpg 624w, https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission.jpg 2048w\" sizes=\"(max-width: 625px) 100vw, 625px\" \/><\/p>\n<p><i><span style=\"font-weight: 400;\">Outre la signalisation lors de la projection et du d\u00e9ploiement du syst\u00e8me de Communications Unifi\u00e9es, nous pourrions \u00e9galement \u00eatre int\u00e9ress\u00e9s par le cryptage du m\u00e9dia transf\u00e9r\u00e9 entre les p\u00e9riph\u00e9riques.<\/span><\/i><\/p>\n<p><span style=\"font-weight: 400;\">Il existe <\/span><b>trois modes de cryptage RTP populaires :<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">SRTP MIKEY \/ SDES (n\u00e9cessite le cryptage TLS de la signalisation)<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">SRTP DTLS<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">ZRTP<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">SRTP<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Le <strong>P<\/strong><b>rotocole de Transport S\u00e9curis\u00e9 en Temps R\u00e9el<\/b> (ou SRTP) d\u00e9finit un <strong>P<\/strong><b>rofil de Protocole RTP<\/b> (Real-Time Transport Protocol, ou protocole de transport en temps r\u00e9el) destin\u00e9 \u00e0 <b>fournir un cryptage<\/b>, <b>une authentification<\/b> et une int\u00e9grit\u00e9 des messages et une <strong>protection contre la r\u00e9ex\u00e9cution des donn\u00e9es RTP<\/strong> dans les applications mono-diffusion et multi-diffusion. Il a \u00e9t\u00e9 publi\u00e9 pour la premi\u00e8re fois par l\u2019IETF en mars 2004 sous le num\u00e9ro <a href=\"https:\/\/tools.ietf.org\/html\/rfc3711\">RFC 3711<\/a>.<\/span><\/p>\n<p><!--more--><\/p>\n<p><span style=\"font-weight: 400;\">Depuis sa cr\u00e9ation, il a \u00e9t\u00e9 adopt\u00e9 par de nombreux fournisseurs, la norme de chiffrement la plus prise en charge \u00e9tant bas\u00e9e sur le chiffrement AES 128.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Les cl\u00e9s \u00e9tant \u00e9chang\u00e9es en texte brut dans les messages SIP, <\/span><b>le cryptage de la signalisation est obligatoire<\/b><span style=\"font-weight: 400;\">. Un inconv\u00e9nient de cette approche en termes de s\u00e9curit\u00e9 est que le proxy SIP situ\u00e9 au milieu conna\u00eet toutes les informations n\u00e9cessaires pour d\u00e9coder le son \u00e9chang\u00e9. Cette configuration est avantageuse dans les environnements corporatifs o\u00f9 l\u2019on souhaite <\/span><b>garantir la confidentialit\u00e9 des donn\u00e9es d&rsquo;entit\u00e9s ext\u00e9rieures <\/b><span style=\"font-weight: 400;\">\u00e0 l&rsquo;entreprise, mais permet toutefois l\u2019activation des fonctionnalit\u00e9s telles que l&rsquo;enregistrement des appels.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">SRTP DTLS<\/span><\/h2>\n<p><b>Le protocole SRTP<\/b><span style=\"font-weight: 400;\"> utilisant le protocole DTLS (Datagram Transport Layer Security) offre une <\/span><b>s\u00e9curit\u00e9 point-to-point<\/b><span style=\"font-weight: 400;\"> (p\u00e9riph\u00e9rique \u00e0 p\u00e9riph\u00e9rique) entre les points finaux d&rsquo;une communication. C&rsquo;est un protocole de s\u00e9curit\u00e9 de canal bas\u00e9 sur du TLS. Les cl\u00e9s de cryptage sont \u00e9chang\u00e9es sur le m\u00eame port, qui est ensuite utilis\u00e9 pour du RTP \u00e0 l&rsquo;aide d&rsquo;un protocole DTLS.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lorsque vous utilisez du DTLS-SRTP :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Les donn\u00e9es d&rsquo;application sont prot\u00e9g\u00e9es gr\u00e2ce au SRTP.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Le handshake DTLS est utilis\u00e9 pour \u00e9tablir les cl\u00e9s, les algorithmes et les param\u00e8tres pour le SRTP.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Une extension DTLS est utilis\u00e9e pour g\u00e9rer les algorithmes SRTP.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">D&rsquo;autres types de contenu de couche d&rsquo;enregistrement DTLS sont prot\u00e9g\u00e9s en utilisant le format d&rsquo;enregistrement DTLS ordinaire.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">En d&rsquo;autres termes, il est essentiel de <\/span><b>garantir la s\u00e9curit\u00e9 au niveau point-to-point<\/b><span style=\"font-weight: 400;\"> (de p\u00e9riph\u00e9rique \u00e0 p\u00e9riph\u00e9rique) et de <\/span><b>ne pas se reposer sur la s\u00e9curit\u00e9 de la signalisation<\/b><span style=\"font-weight: 400;\"> (par exemple, SIP).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">SRTP-DTLS est actuellement pris en charge par les navigateurs WebRTC. Il s&rsquo;agit du <\/span><b>mode de cryptage RTP obligatoire<\/b><span style=\"font-weight: 400;\"> du projet \/ de la sp\u00e9cification WebRTC. Il remplace SRTP SDES, qui avait \u00e9t\u00e9 initialement envisag\u00e9 et ajout\u00e9 dans l\u2019impl\u00e9mentation de Chrome WebRTC. Il a \u00e9t\u00e9 s\u00e9lectionn\u00e9 \u00e0 la place du SRTP SDES car <\/span><b>il garantit une meilleure confidentialit\u00e9 des communications point \u00e0 point.<\/b><\/p>\n<h2><span style=\"font-weight: 400;\">ZRTP<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Le ZRTP offre \u00e9galement un <\/span><b>protocole de cryptage point-to point<\/b><span style=\"font-weight: 400;\">, mais il n\u2019est pas r\u00e9guli\u00e8rement pris en charge.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Afin de cr\u00e9er un cryptage point \u00e0 point, <\/span><b>un secret partag\u00e9 et d\u2019autres param\u00e8tres de s\u00e9curit\u00e9 sont \u00e9chang\u00e9s,<\/b><span style=\"font-weight: 400;\"> en s\u2019appuyant sur le protocole d\u2019\u00e9change de cl\u00e9s Diffie-Hellman. L\u2019authentification mutuelle peut utiliser une cha\u00eene d\u2019authentification courte (SAS), elle ne n\u00e9cessite donc pas de prise en charge par une infrastructure \u00e0 cl\u00e9 publique (PKI). L&rsquo;\u00e9change ZRTP s&rsquo;effectue sur les m\u00eames num\u00e9ros de port que ceux utilis\u00e9s par la session multim\u00e9dia pour le trafic RTP (par opposition au chemin de signalisation).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L&rsquo;authentification, puis l&rsquo;\u00e9change de m\u00e9dia crypt\u00e9, sont effectu\u00e9s sur un seul port, comme indiqu\u00e9 dans le SDP. Le ZRTP emp\u00eache l&rsquo;\u00e9coute indiscr\u00e8te, mais \u00e0 l\u2019inverse pose des probl\u00e8mes si l&rsquo;enregistrement des appels doit \u00eatre effectu\u00e9.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De nos jours, le protocole ZRTP est principalement mis en \u0153uvre dans les softphones SIP. La plupart des clients reviennent g\u00e9n\u00e9ralement sur le RTP standard si le ZRTP n&rsquo;est pas pris en charge par le point de terminaison distant.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Conclusions<\/span><\/h2>\n<p><b>Le cryptage des supports <\/b><span style=\"font-weight: 400;\">est un sujet important et chaque syst\u00e8me de Communications Unifi\u00e9es doit le mettre en \u0153uvre pour les appels sur des r\u00e9seaux de donn\u00e9es publics.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nous devons nous rappeler que lorsque les appels sont achemin\u00e9s sur des r\u00e9seaux RTPC traditionnels, ils sont sujets \u00e0 l\u2019\u00e9coute des forces de l\u2019ordre et des op\u00e9rateurs. Si la confidentialit\u00e9 est importante dans tous les sc\u00e9narios, nous devons informer les utilisateurs et leur demander de communiquer via des connexions VoIP pures.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En conclusion, l\u2019utilisation de WebRTC et de la t\u00e9l\u00e9phonie VoIP offre un moyen plus pratique et plus s\u00fbr d\u2019encourager la communication entre les membres de l\u2019\u00e9quipe et les clients.<\/span><span style=\"font-size: 1rem;\">[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=\u00a0\u00bb.vc_custom_1538569252694{margin-bottom: 50px !important;background-color: #ededed !important;}\u00a0\u00bb][vc_column][vc_separator color=\u00a0\u00bbcustom\u00a0\u00bb border_width=\u00a0\u00bb3&Prime; accent_color=\u00a0\u00bb#003366&Prime;][vc_row_inner][vc_column_inner width=\u00a0\u00bb1\/3&Prime;][vc_single_image image=\u00a0\u00bb19386&Prime; img_size=\u00a0\u00bbmedium\u00a0\u00bb alignment=\u00a0\u00bbcenter\u00a0\u00bb style=\u00a0\u00bbvc_box_shadow_border\u00a0\u00bb onclick=\u00a0\u00bbcustom_link\u00a0\u00bb img_link_target=\u00a0\u00bb_blank\u00a0\u00bb link=\u00a0\u00bbhttp:\/\/www.wildix.com\/buy-the-book\u00a0\u00bb][\/vc_column_inner][vc_column_inner width=\u00a0\u00bb2\/3&Prime;][vc_column_text]<\/span><\/p>\n<h2 style=\"text-align: center;\">ACHETEZ LE LIVRE<\/h2>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><strong>(No) Value in Unified Communications<\/strong><br \/>\nby Dimitri Osler<\/h2>\n<p>[\/vc_column_text][vc_btn title=\u00a0\u00bbBuy the Book for 19,90 \u20ac\u00a0\u00bb style=\u00a0\u00bbflat\u00a0\u00bb color=\u00a0\u00bborange\u00a0\u00bb align=\u00a0\u00bbcenter\u00a0\u00bb button_block=\u00a0\u00bbtrue\u00a0\u00bb link=\u00a0\u00bburl:http%3A%2F%2Fwww.wildix.com%2Fbuy-the-book||target:%20_blank|\u00a0\u00bb][\/vc_column_inner][\/vc_row_inner][vc_separator color=\u00a0\u00bbcustom\u00a0\u00bb border_width=\u00a0\u00bb3&Prime; accent_color=\u00a0\u00bb#003366&Prime;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text] Outre la signalisation lors de la projection et du d\u00e9ploiement du syst\u00e8me de Communications Unifi\u00e9es, nous pourrions \u00e9galement \u00eatre int\u00e9ress\u00e9s par le cryptage du m\u00e9dia transf\u00e9r\u00e9 entre les p\u00e9riph\u00e9riques. Il existe trois modes de cryptage RTP populaires : SRTP MIKEY \/ SDES (n\u00e9cessite le cryptage TLS de la signalisation) SRTP DTLS ZRTP SRTP Le &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/blog.wildix.com\/fr\/transmission-securisee-des-medias\/\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;Transmission s\u00e9curis\u00e9e des m\u00e9dias&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53,80],"tags":[],"class_list":["post-38261","post","type-post","status-publish","format-standard","hentry","category-blog-fr","category-infostechniques"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Transmission s\u00e9curis\u00e9e des m\u00e9dias | Wildix<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Transmission s\u00e9curis\u00e9e des m\u00e9dias | Wildix\" \/>\n<meta property=\"og:description\" content=\"[vc_row][vc_column][vc_column_text] Outre la signalisation lors de la projection et du d\u00e9ploiement du syst\u00e8me de Communications Unifi\u00e9es, nous pourrions \u00e9galement \u00eatre int\u00e9ress\u00e9s par le cryptage du m\u00e9dia transf\u00e9r\u00e9 entre les p\u00e9riph\u00e9riques. Il existe trois modes de cryptage RTP populaires : SRTP MIKEY \/ SDES (n\u00e9cessite le cryptage TLS de la signalisation) SRTP DTLS ZRTP SRTP Le &hellip; Continuer la lecture de &laquo;&nbsp;Transmission s\u00e9curis\u00e9e des m\u00e9dias&nbsp;&raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wildix.com\/fr\/transmission-securisee-des-medias\/\" \/>\n<meta property=\"og:site_name\" content=\"Wildix Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/wildix.pbx\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/dimitri.osler\" \/>\n<meta property=\"article:published_time\" content=\"2020-02-07T06:30:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/12\/Secure-media-transmission-1024x683.jpg\" \/>\n<meta name=\"author\" content=\"Dimitri Osler\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" 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