{"id":887,"date":"2024-01-09T14:45:32","date_gmt":"2024-01-09T13:45:32","guid":{"rendered":"https:\/\/betterweb.qwant.com\/?p=887"},"modified":"2024-01-09T14:54:40","modified_gmt":"2024-01-09T13:54:40","slug":"on-decrypte-le-chiffrement","status":"publish","type":"post","link":"https:\/\/betterweb.qwant.com\/2024\/01\/09\/on-decrypte-le-chiffrement\/","title":{"rendered":"On d\u00e9crypte\u00a0: le chiffrement"},"content":{"rendered":"<h2><span style=\"color: #1f70ff;\"><strong>Qu\u2019est-ce que c\u2019est\u00a0?<\/strong><\/span><\/h2>\n<p>Il s\u2019agit d\u2019un processus utilisant un algorithme qui transforme les caract\u00e8res de texte standard en un format illisible afin que seuls les utilisateurs autoris\u00e9s puissent lire les informations.<\/p>\n<p>Lorsque vous communiquez sur internet, vos donn\u00e9es traversent potentiellement des centaines, voire des milliers de kilom\u00e8tres avant d\u2019arriver \u00e0 destination. Des c\u00e2bles, des routeurs, des serveurs sont n\u00e9cessaires pour v\u00e9hiculer vos donn\u00e9es. Mais cela signifie-t-il que tous ces \u00e9l\u00e9ments ont n\u00e9cessairement acc\u00e8s \u00e0 tout ce que vous envoyez, alors qu\u2019ils n\u2019en sont pas les destinataires finaux ? Non ! Il est possible de prot\u00e9ger vos donn\u00e9es contre des oreilles indiscr\u00e8tes gr\u00e2ce \u00e0 la cryptographie, la science des codes secrets, via un proc\u00e9d\u00e9 que l\u2019on appelle le \u00ab chiffrement \u00bb.<\/p>\n<p>Prenons un exemple : lorsque vous vous connectez au site <a href=\"https:\/\/www.qwant.com\/\">https:\/\/www.qwant.com\/<\/a> et que vous y effectuez une recherche, votre requ\u00eate est automatiquement \u00ab chiffr\u00e9e \u00bb par votre navigateur avant d\u2019\u00eatre envoy\u00e9e aux serveurs de Qwant, o\u00f9 elle sera \u00ab d\u00e9chiffr\u00e9e \u00bb de mani\u00e8re \u00e0 permettre \u00e0 Qwant de pr\u00e9parer une liste de sites pertinents \u00e0 vous renvoyer. Bien \u00e9videmment, cette liste est, elle aussi, chiffr\u00e9e par Qwant avant de vous \u00eatre envoy\u00e9e. Votre navigateur d\u00e9chiffre alors ce r\u00e9sultat juste avant de vous l\u2019afficher. Le tour est jou\u00e9 !<\/p>\n<p>Via le chiffrement, vos recherches ne sont connues que de vous et de Qwant, qui ne sait pas qui se cache derri\u00e8re la recherche.<\/p>\n<h2><strong><span style=\"color: #1f70ff;\">Et entre diff\u00e9rents interlocuteurs physiques, comment \u00e7a se passe\u00a0?<\/span> <\/strong><\/h2>\n<p>Lorsque vous envoyez un message \u00e0 un correspondant via une messagerie grand public classique, il est g\u00e9n\u00e9ralement chiffr\u00e9 entre votre dispositif (smartphone ou ordinateur) et le serveur de l\u2019op\u00e9rateur proposant le service de messagerie, qui le d\u00e9chiffre afin de le stocker \u00ab en clair \u00bb en attendant que le destinataire viennent le chercher. Ce message est ensuite chiffr\u00e9 entre le serveur et le destinataire final. C\u2019est ce que l\u2019on appelle du \u00ab chiffrement de point \u00e0 point \u00bb. Le probl\u00e8me ? C\u2019est que le fournisseur du service a acc\u00e8s \u00e0 tout ce que vous communiquez alors qu\u2019il n\u2019en est pas le destinataire final. C\u2019est l\u00e0 qu\u2019intervient le chiffrement de bout en bout. Cette technologie permet de s\u2019assurer que vos messages seront chiffr\u00e9s sur votre dispositif avant de le quitter et ne seront d\u00e9chiffr\u00e9s qu\u2019\u00e0 un seul endroit : sur le dispositif de votre destinataire. Entre les deux, vos messages restent chiffr\u00e9s, y compris lorsqu&#8217;ils sont stock\u00e9s sur le serveur du fournis- seur du service. Le tour est \u00e0 nouveau jou\u00e9 !<\/p>\n<p>Cela peut para\u00eetre surprenant : le chiffrement de bout en bout ne fait que reproduire dans un monde num\u00e9rique ce que nous faisons depuis des si\u00e8cles avec nos lettres physiques : nous les glissons dans des enveloppes avant de les envoyer !<\/p>\n<h6>Source image : <a href=\"https:\/\/fr.freepik.com\/photos-gratuite\/securite-abstraite-du-code-binaire-metallique-puce-informatique-generee-par-ia_41367450.htm#query=chiffrement&amp;position=26&amp;from_view=search&amp;track=sph\">Freepik<\/a><\/h6>\n","protected":false},"excerpt":{"rendered":"<p>Qu\u2019est-ce que c\u2019est\u00a0? Il s\u2019agit d\u2019un processus utilisant un algorithme qui transforme les caract\u00e8res de texte standard en un format illisible afin que seuls les [&hellip;]<\/p>\n","protected":false},"author":22,"featured_media":888,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[92,93,51],"class_list":["post-887","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vie-privee","tag-chiffrement","tag-decryptage","tag-privacy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>On d\u00e9crypte\u00a0: le chiffrement - Better Web<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/betterweb.qwant.com\/2024\/01\/09\/on-decrypte-le-chiffrement\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On d\u00e9crypte\u00a0: le chiffrement - Better Web\" \/>\n<meta property=\"og:description\" content=\"Qu\u2019est-ce que c\u2019est\u00a0? 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