{"id":133,"date":"2018-03-10T17:06:51","date_gmt":"2018-03-10T16:06:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/lehning\/?p=133"},"modified":"2020-01-11T14:36:48","modified_gmt":"2020-01-11T13:36:48","slug":"messages-chiffres-figaro-1890","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/03\/10\/messages-chiffres-figaro-1890\/","title":{"rendered":"Les messages chiffr\u00e9s du Figaro en 1890"},"content":{"rendered":"

En 1890, le Figaro contenait une rubrique de correspondances personnelles dont certains messages \u00e9taient a priori<\/em> incompr\u00e9hensibles. Voici une partie de ceux du premier janvier\u00a0:<\/p>\n

\"\"
La rubrique correspondances personnelles du Figaro, du premier janvier 1890. @ BNF<\/figcaption><\/figure>\n

Chiffre de C\u00e9sar<\/h2>\n

Parmi\u00a0des messages \u00e9crits en style t\u00e9l\u00e9graphique, nous en trouvons deux, manifestement enti\u00e8rement chiffr\u00e9s. Dans le premier, bonne ann\u00e9e<\/em> est devenue cpoof booff. Autrement dit, il s\u2019agit d\u2019un simple d\u00e9calage (ou chiffre de C\u00e9sar) et le tout signifie\u00a0: Bonne ann\u00e9e d\u2019un ami bien malheureux<\/em>.<\/p>\n

Substitution alphab\u00e9tique<\/h2>\n

Le message suivant (d’indicatif LILI) est bien plus int\u00e9ressant \u00e0 d\u00e9crypter. De prime abord, nous pouvons juste penser que le chiffre 2 repr\u00e9sente e, du moins si la m\u00e9thode de chiffrement utilis\u00e9e est une substitution alphab\u00e9tique car il s’agit du symbole majoritaire. Heureusement, en feuilletant le Figaro des jours suivants, nous rencontrons un grand nombre de messages sous le m\u00eame indicatif LILI. Nous nous arr\u00eatons naturellement le douze janvier sur un message \u00e0 moiti\u00e9 chiffr\u00e9, une erreur classique de chiffrement.<\/p>\n

\"\"
La rubrique correspondances personnelles du 12 janvier 1890 dans le Figaro. @BNF<\/figcaption><\/figure>\n

\u00c9crit en style t\u00e9l\u00e9graphique, le message commence par votre pens\u00e9e ne me quitte pas, est tout mon bonheur, voudrais vous voir<\/em>, la suite qu\u2019on veut cacher est 32. u. 13. n2. La disposition des deux 2 nous fait penser \u00e0 je t\u2019aime<\/em> si i<\/em> et j<\/em> sont assimil\u00e9s comme ils le sont en latin. Les chiffres 1, 2 et 3 repr\u00e9sentent donc les voyelles a<\/em>, e <\/em>et i<\/em>, les lettres u et n repr\u00e9sentent t<\/em> et m<\/em>. La m\u00e9thode de chiffrement semble \u00eatre de repr\u00e9senter chaque voyelle par son num\u00e9ro d\u2019ordre et chaque consonne par la lettre qui la suit. Pour v\u00e9rifier cette hypoth\u00e8se, nous revenons au message du premier janvier\u00a0:<\/p>\n

1.w. m2. qs2n32s n2t w25y c400. 100. w45e. 2us2. u. qs2t e w. o. q20t r s2w.<\/p>\n

En le d\u00e9chiffrant selon la m\u00e9thode que nous venons d\u2019exposer, on obtient une phrase en style t\u00e9l\u00e9graphique\u00a0:<\/p>\n

a v le premier mes veux bonn ann voud etre t pres d v n pens q rev<\/em><\/p>\n

ce qui signifie probablement\u00a0:<\/p>\n

\u00c0 vous le premier, mes v\u0153ux de bonne ann\u00e9e. Je voudrais \u00eatre tout pr\u00e8s de vous. Ne pense qu\u2019un r\u00eave\u00a0! <\/em><\/p>\n

M\u00eame si une erreur a pu se glisser dans la derni\u00e8re phrase, le sens des deux premi\u00e8res prouve que notre hypoth\u00e8se est correcte. De fa\u00e7on \u00e9tonnante, la m\u00e9thode de d\u00e9cryptement fonctionne pour un autre message du douze janvier, celui portant l\u2019indicatif Bleuet\u00a0:<\/p>\n

\u00a0Compl\u00e8tement r\u00e9tabli. Rentre \u00e0 Paris semaine prochaine, je serai heureux de pouvoir vous voir mercredi 4 h. Mille amiti\u00e9s.<\/em><\/p>\n

Int\u00e9r\u00eat<\/h2>\n

Au-del\u00e0 des curieux, ces messages chiffr\u00e9s pourront int\u00e9resser les historiens qui y verront un t\u00e9moignage des rapports humains \u00e0 cette \u00e9poque, surtout de ceux que l\u2019on souhaitait cacher.<\/span><\/span><\/p>\n

<\/h2>\n","protected":false},"excerpt":{"rendered":"

En 1890, le Figaro contenait une rubrique de correspondances personnelles dont certains messages \u00e9taient a priori incompr\u00e9hensibles. Voici une partie de ceux du premier janvier\u00a0: Chiffre de C\u00e9sar Parmi\u00a0des messages \u00e9crits en style t\u00e9l\u00e9graphique, nous en trouvons deux, manifestement enti\u00e8rement chiffr\u00e9s. Dans le premier, bonne ann\u00e9e est devenue cpoof booff. Autrement dit, il s\u2019agit d\u2019un … Continuer la lecture de Les messages chiffr\u00e9s du Figaro en 1890<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":12,"featured_media":137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[9],"tags":[58,43,59],"class_list":["post-133","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cryptologie","tag-chiffre","tag-cryptographie","tag-cryptologie"],"yoast_head":"\nLes messages chiffr\u00e9s du Figaro en 1890, 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\/10\/messages-chiffres-figaro-1890\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les messages chiffr\u00e9s du Figaro en 1890, par Herv\u00e9 Lehning\" \/>\n<meta property=\"og:description\" content=\"En 1890, le Figaro contenait une rubrique de correspondances personnelles dont certains messages \u00e9taient a priori incompr\u00e9hensibles. Voici une partie de ceux du premier janvier\u00a0: Chiffre de C\u00e9sar Parmi\u00a0des messages \u00e9crits en style t\u00e9l\u00e9graphique, nous en trouvons deux, manifestement enti\u00e8rement chiffr\u00e9s. Dans le premier, bonne ann\u00e9e est devenue cpoof booff. 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