{"id":155,"date":"2018-03-30T09:10:02","date_gmt":"2018-03-30T07:10:02","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/lehning\/?p=155"},"modified":"2018-05-22T18:18:05","modified_gmt":"2018-05-22T16:18:05","slug":"chiffre-de-reine-marie-antoinette","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/03\/30\/chiffre-de-reine-marie-antoinette\/","title":{"rendered":"Le chiffre de la reine Marie-Antoinette"},"content":{"rendered":"<p><span style=\"margin: 0px;line-height: 200%;font-family: 'Times New Roman',serif;font-size: 12pt\"><span style=\"color: #000000\">Pour qu\u2019elles ne puissent pas \u00eatre intercept\u00e9es, Marie-Antoinette chiffrait ses lettres. La m\u00e9thode qu\u2019elle utilisait \u00e9tait a priori excellente\u2026 mais avec une erreur majeure\u00a0: elle ne chiffrait qu\u2019une lettre sur deux.<\/span><\/span><\/p>\n<h2>Chiffre de Vigen\u00e8re<\/h2>\n<p><span style=\"margin: 0px;line-height: 200%;font-family: 'Times New Roman',serif;font-size: 12pt\"><span style=\"color: #000000\">Marie-Antoinette chiffrait ses lettres par substitution poly-alphab\u00e9tique, selon la m\u00e9thode d\u00e9crite par Blaise de Vigen\u00e8re plus pr\u00e9cis\u00e9ment. Cette m\u00e9thode suppose de disposer d\u2019une table de chiffrement, si possible une par destinataire. Voici comment se pr\u00e9sentait ces tables\u00a0:<\/span><\/span><\/p>\n<figure id=\"attachment_156\" aria-describedby=\"caption-attachment-156\" style=\"width: 176px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-156 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/03\/TableChiffrementMarieAntoinetteItalie-176x300.jpg\" alt=\"\" width=\"176\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/03\/TableChiffrementMarieAntoinetteItalie-176x300.jpg 176w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/03\/TableChiffrementMarieAntoinetteItalie.jpg 296w\" sizes=\"auto, (max-width: 176px) 100vw, 176px\" \/><figcaption id=\"caption-attachment-156\" class=\"wp-caption-text\">Une table de chiffrement utilis\u00e9e par Marie-Antoinette. @ Archives nationales<\/figcaption><\/figure>\n<p><span style=\"margin: 0px;line-height: 200%;font-family: 'Times New Roman',serif;font-size: 12pt\"><span style=\"color: #000000\">On notera que ce tableau ne contient que 22 lettres, les lettres manquantes sont J, K, U et W, ce qui correspond \u00e0 un usage venant du latin o\u00f9 I et J d\u2019un c\u00f4t\u00e9, U et V de l\u2019autre sont confondues. K peut \u00eatre remplac\u00e9 par C et W par V.<\/span><\/span><\/p>\n<h2>Clef de chiffrement<\/h2>\n<p>L\u2019utilisation de ce tableau pour chiffrer demande une clef secr\u00e8te qu\u2019on partage avec le destinataire. Par exemple, si la clef est <em>sel<\/em>, pour chiffrer la premi\u00e8re lettre, on utilise la ligne dont la premi\u00e8re colonne est ST, D est alors chang\u00e9 en N (et N en D), E en O, etc. Pour chiffrer la seconde, on utilise la ligne dont la premi\u00e8re colonne est EF.<\/p>\n<h2>Utilisation correcte<\/h2>\n<p>Pour chiffrer une phrase comme <em>je vous aime<\/em>, on peut construire un tableau \u00e0 10 lignes et 3 colonnes\u00a0:<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"38\">J<\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\">V<\/td>\n<td width=\"38\">O<\/td>\n<td width=\"38\">U<\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\">A<\/td>\n<td width=\"38\">I<\/td>\n<td width=\"38\">M<\/td>\n<td width=\"38\">E<\/td>\n<\/tr>\n<tr>\n<td width=\"38\">S<\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\">L<\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\">L<\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\">L<\/td>\n<td width=\"38\">S<\/td>\n<\/tr>\n<tr>\n<td width=\"38\">S<\/td>\n<td width=\"38\">T<\/td>\n<td width=\"38\">D<\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\">F<\/td>\n<td width=\"38\">B<\/td>\n<td width=\"38\">X<\/td>\n<td width=\"38\">Z<\/td>\n<td width=\"38\">Q<\/td>\n<td width=\"38\">O<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Le message chiffr\u00e9 est donc <em>stdefbxzqo<\/em>. Si vous essayez de chiffrer une lettre ainsi, vous verrez la difficult\u00e9 d\u2019\u00e9viter les erreurs. C\u2019est pour cela que, on ne sait quel cryptologue avait conseill\u00e9 \u00e0 Marie-Antoinette de ne chiffrer qu\u2019une lettre sur deux ce qui, en fournissant des rep\u00e8res, simplifie grandement le chiffrement mais l\u2019affaiblit tout aussi grandement. Nous allons voir pourquoi.<\/p>\n<h2>Utilisation par Marie-Antoinette<\/h2>\n<p>Le tableau devient ainsi\u00a0:<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"38\">J<\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\">V<\/td>\n<td width=\"38\">O<\/td>\n<td width=\"38\">U<\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\">A<\/td>\n<td width=\"38\">I<\/td>\n<td width=\"38\">M<\/td>\n<td width=\"38\">E<\/td>\n<\/tr>\n<tr>\n<td width=\"38\"><\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\"><\/td>\n<td width=\"38\">E<\/td>\n<td width=\"38\"><\/td>\n<td width=\"38\">L<\/td>\n<td width=\"38\"><\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\"><\/td>\n<td width=\"38\">E<\/td>\n<\/tr>\n<tr>\n<td width=\"38\">J<\/td>\n<td width=\"38\">O<\/td>\n<td width=\"38\">V<\/td>\n<td width=\"38\">M<\/td>\n<td width=\"38\">U<\/td>\n<td width=\"38\">B<\/td>\n<td width=\"38\">A<\/td>\n<td width=\"38\">S<\/td>\n<td width=\"38\">M<\/td>\n<td width=\"38\">T<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Le message chiffr\u00e9 est maintenant <em>jovmubasmt<\/em>. On peut examiner des lettres chiffr\u00e9es ainsi par Marie-Antoinette aux Archives nationales, comme la suivante\u00a0:<\/p>\n<figure id=\"attachment_157\" aria-describedby=\"caption-attachment-157\" style=\"width: 224px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-157 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/03\/lettre-marie-antoinette-fersen-legere-224x300.jpg\" alt=\"\" width=\"224\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/03\/lettre-marie-antoinette-fersen-legere-224x300.jpg 224w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/03\/lettre-marie-antoinette-fersen-legere.jpg 529w\" sizes=\"auto, (max-width: 224px) 100vw, 224px\" \/><figcaption id=\"caption-attachment-157\" class=\"wp-caption-text\">Lettre de Marie-Antoinette au comte de Fersen o\u00f9 on voit qu&#8217;elle ne chiffrait qu&#8217;une lettre sur deux. @ Archives nationales<\/figcaption><\/figure>\n<h2>D\u00e9cryptement<\/h2>\n<p><span style=\"margin: 0px;line-height: 200%;font-family: 'Times New Roman',serif;font-size: 12pt\"><span style=\"color: #000000\">Le d\u00e9cryptement sans conna\u00eetre la clef est ainsi facilit\u00e9, surtout si on conna\u00eet le tableau de chiffrement. C\u2019est ici que des talents de cruciverbiste sont utiles. En effet, on peut deviner un mot si on en conna\u00eet une lettre sur deux comme ici J-V-U-A-M, qui est transparent pour tout amateur de mots crois\u00e9s. Ensuite, on sait que la premi\u00e8re lettre de la clef transforme E en O ce qui ne se produit que pour ST, en continuant ainsi, on d\u00e9crypte le message quel que soit sa longueur.<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Pour qu\u2019elles ne puissent pas \u00eatre intercept\u00e9es, Marie-Antoinette chiffrait ses lettres. La m\u00e9thode qu\u2019elle utilisait \u00e9tait a priori excellente\u2026 mais avec une erreur majeure\u00a0: elle ne chiffrait qu\u2019une lettre sur deux. Chiffre de Vigen\u00e8re Marie-Antoinette chiffrait ses lettres par substitution poly-alphab\u00e9tique, selon la m\u00e9thode d\u00e9crite par Blaise de Vigen\u00e8re plus pr\u00e9cis\u00e9ment. Cette m\u00e9thode suppose de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/03\/30\/chiffre-de-reine-marie-antoinette\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Le chiffre de la reine Marie-Antoinette<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":12,"featured_media":159,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[9,63],"tags":[58,59,64,66,65],"class_list":["post-155","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cryptologie","category-histoire","tag-chiffre","tag-cryptologie","tag-marie-antoinette","tag-monarchie","tag-revolution"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le chiffre de la reine Marie-Antoinette, par Herv\u00e9 Lehning<\/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:\/\/blogs.futura-sciences.com\/lehning\/2018\/03\/30\/chiffre-de-reine-marie-antoinette\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le chiffre de la reine Marie-Antoinette, par Herv\u00e9 Lehning\" \/>\n<meta property=\"og:description\" content=\"Pour qu\u2019elles ne puissent pas \u00eatre intercept\u00e9es, Marie-Antoinette chiffrait ses lettres. 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