{"id":1334,"date":"2024-12-21T19:08:39","date_gmt":"2024-12-21T17:08:39","guid":{"rendered":"https:\/\/twp.starinux.org\/?p=1334"},"modified":"2025-10-31T19:53:46","modified_gmt":"2025-10-31T17:53:46","slug":"cryptologie-21-decembre-2024-courbevoie","status":"publish","type":"post","link":"https:\/\/www.starinux.org\/?p=1334","title":{"rendered":"CRYPTOLOGIE\u00a0&#8211; 21 d\u00e9cembre 2024   Courbevoie"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>PR\u00c9SENTATION<\/strong>\u00a0: en informatique, la Cryptographie est tr\u00e8s importante. Entre autres,Christian Dufour l&rsquo;animateur, vous expliquera le sens pr\u00e9cis de ces termes :<br>(d\u00e9)chiffrer, (d\u00e9)chiffrage, (d\u00e9)crypter, (d\u00e9)cryptage, chiffrage sans cl\u00e9&#8230; selon si cl\u00e9 publique utilis\u00e9e ou pas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PROGRAMME<\/strong>\u00a0: le matin, allez un peu de th\u00e9orie indispensable et sympa ! L&rsquo;apr\u00e8s-midi, de la pratique qui fait bien comprendre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>INTRODUCTION au syst\u00e8me RSA<\/strong>\u00a0de chiffrement par cl\u00e9 publique :<br>1) Quelques outils math\u00e9matiques de base simple : PGCD, B\u00e9zout&#8230;;<br>2) Exemple d&rsquo;\u00e9tapes du protocole de Diffie-Hellmann (DH) de calcul de cl\u00e9 publique;<br>3) Exemple d&rsquo;\u00e9tapes du protocole RSA de (d\u00e9)chiffrement d&rsquo;un texte court;<br>4) Exemples simples de calcul de cl\u00e9 DH et (d\u00e9)chiffrement RSA avec de petits nombres 1ers;<br>5) Exercices de calculs modulaires, factorisation d&rsquo;entiers, test de primalit\u00e9;<br>6) (d\u00e9)chiffrement RSA..<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>EXPLICATION<\/strong>\u00a0: le chiffrement RSA (nomm\u00e9 par les initiales de ses 3 inventeurs) est un algorithme de cryptographie asym\u00e9trique, tr\u00e8s utilis\u00e9 dans le commerce \u00e9lectronique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>INT\u00c9R\u00caTS<\/strong>\u00a0: Identifiant, passphrase, mot de passe, chiffrage de textes, de disques durs, de fichiers, cl\u00e9s publiques et priv\u00e9es, connexion SSH..<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>MODALIT\u00c9S<\/strong>\u00a0: \u00eatre adh\u00e9rent(e), 20\u20ac\/an (10\u20ac demandeurs d&#8217;emploi) valable 1 an pour plus de 10 ateliers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PR\u00c9SENTATION\u00a0: en informatique, la Cryptographie est tr\u00e8s importante. Entre autres,Christian Dufour l&rsquo;animateur, vous expliquera le sens pr\u00e9cis de ces termes :(d\u00e9)chiffrer, (d\u00e9)chiffrage, (d\u00e9)crypter, (d\u00e9)cryptage, chiffrage sans cl\u00e9&#8230; selon si cl\u00e9 publique utilis\u00e9e ou pas. PROGRAMME\u00a0: le matin, allez un peu de th\u00e9orie indispensable et sympa ! L&rsquo;apr\u00e8s-midi, de la pratique qui fait bien comprendre. INTRODUCTION &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"https:\/\/www.starinux.org\/?p=1334\">Lire la suite<\/a><\/p>\n","protected":false},"author":2,"featured_media":1355,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_crdt_document":"","_piecal_is_event":true,"_piecal_start_date":"2024-12-21T18:50:00","_piecal_end_date":"2024-12-21T18:50:00","_piecal_is_allday":false,"footnotes":""},"categories":[16],"tags":[],"class_list":["post-1334","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ateliers-passes","item-wrap"],"publishpress_future_action":{"enabled":false,"date":"2026-04-15 14:56:51","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/posts\/1334","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.starinux.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1334"}],"version-history":[{"count":1,"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/posts\/1334\/revisions"}],"predecessor-version":[{"id":1335,"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/posts\/1334\/revisions\/1335"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.starinux.org\/index.php?rest_route=\/wp\/v2\/media\/1355"}],"wp:attachment":[{"href":"https:\/\/www.starinux.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.starinux.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.starinux.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}