{"id":3039,"date":"2026-02-11T12:02:25","date_gmt":"2026-02-11T10:02:25","guid":{"rendered":"https:\/\/computershop.eu\/blog\/?p=3033"},"modified":"2026-02-11T12:30:00","modified_gmt":"2026-02-11T10:30:00","slug":"comment-les-hackers-deduisent-ils-les-mots-de-passe-sans-laide-de-lia","status":"publish","type":"post","link":"https:\/\/computershop.eu\/blog\/fr\/comment-les-hackers-deduisent-ils-les-mots-de-passe-sans-laide-de-lia","title":{"rendered":"Comment les mots de passe sont-ils devin\u00e9s sans l&#8217;aide de l&#8217;IA ??"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>\n<p>\u00c0 l&#8217;\u00e8re de la cybers\u00e9curit\u00e9, la plupart des organisations mettent l&#8217;accent sur des r\u00e8gles de complexit\u00e9 des mots de passe ou sur des solutions sophistiqu\u00e9es comme l&#8217;intelligence artificielle pour la protection des comptes. Cependant, les attaquants n&#8217;ont pas n\u00e9cessairement besoin d&#8217;IA pour deviner les mots de passe; les m\u00e9thodes classiques, bien comprises et adapt\u00e9es au contexte, restent extr\u00eamement efficaces.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi les attaques par devinette de mots de passe fonctionnent sans IA<\/h2>\n\n\n\n<p>Contrairement \u00e0 la perception g\u00e9n\u00e9rale, la plupart des attaques par devinette de mots de passe n&#8217;impliquent pas de mod\u00e8les d&#8217;intelligence artificielle ou de techniques avanc\u00e9es d&#8217;apprentissage automatique. Au lieu de cela, les attaquants utilisent des listes de mots de passe g\u00e9n\u00e9r\u00e9es \u00e0 partir du langage et des informations publiques disponibles sur l&#8217;organisation cibl\u00e9e.<\/p>\n\n\n\n<p>Cette approche exploite un fait simple: les utilisateurs ont tendance \u00e0 cr\u00e9er des mots de passe faciles \u00e0 retenir. Au lieu d&#8217;utiliser des combinaisons de caract\u00e8res compl\u00e8tement al\u00e9atoires, ils incluent dans leurs mots de passe des termes familiers. Par exemple, le nom de l&#8217;entreprise, des produits, des lieux ou d&#8217;autres d\u00e9tails associ\u00e9s \u00e0 l&#8217;organisation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Que sont les listes de mots de passe contextualis\u00e9es (targeted wordlists)<\/h2>\n\n\n\n<p>Les listes de mots de passe adapt\u00e9es au contexte sont g\u00e9n\u00e9r\u00e9es en collectant des mots et des expressions provenant de sources publiques de l&#8217;organisation cibl\u00e9e. Celles-ci incluent les sites web, les blogs, les pages de description des services, etc. Les informations collect\u00e9es sont ensuite transform\u00e9es en combinaisons de mots de passe possibles.<\/p>\n\n\n\n<p>Un outil tr\u00e8s populaire pour cette t\u00e2che est <strong>CeWL<\/strong> (Custom Word List Generator), un crawler open-source largement utilis\u00e9 par les pentesteurs et les attaquants. CeWL extrait des termes des pages web, puis cr\u00e9e une liste de mots qui refl\u00e8te le langage sp\u00e9cifique de l&#8217;organisation.<\/p>\n\n\n\n<p><strong>Ces termes \u00ab contextuels \u00bb incluent g\u00e9n\u00e9ralement :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le nom de l&#8217;entreprise ou de l&#8217;organisation<\/li>\n\n\n\n<li>Les services, produits ou acronymes internes<\/li>\n\n\n\n<li>Les noms de lieux ou de projets<\/li>\n\n\n\n<li>Les termes industriels pertinents pour le domaine.<\/li>\n<\/ul>\n\n\n\n<p>La liste r\u00e9sultante peut sembler inhabituelle pour une attaque informatique \u00ab g\u00e9n\u00e9rique \u00bb, mais pour une attaque cibl\u00e9e, elle est particuli\u00e8rement efficace, car elle refl\u00e8te exactement le langage utilis\u00e9 au sein de l&#8217;organisation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment les mots de passe sont-ils d\u00e9duits, en pratique<\/h2>\n\n\n\n<p>Une simple liste de mots extraits du site ne suffit pas pour une attaque efficace. Cette \u00ab base de donn\u00e9es \u00bb est ensuite soumise \u00e0 un \u00ab traitement \u00bb avec des permutations et des combinaisons pour g\u00e9n\u00e9rer des mots. Des exemples de transformations incluent :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L&#8217;ajout de chiffres \u00e0 la fin des mots (par ex. <em>Entreprise123<\/em>)<\/li>\n\n\n\n<li>Des changements de capitalisation (<em>entreprise<\/em>, <em>Entreprise<\/em>, <em>ENTREPRISE<\/em>)<\/li>\n\n\n\n<li>L&#8217;ajout de symboles tels que !, @, #<\/li>\n\n\n\n<li>La combinaison de plusieurs termes en une seule cha\u00eene.<\/li>\n<\/ul>\n\n\n\n<p>Des outils comme <strong><a href=\"https:\/\/hashcat.net\/hashcat\/\" target=\"_blank\" rel=\"noreferrer noopener\">Hashcat<\/a><\/strong> permettent ensuite d&#8217;utiliser ces r\u00e8gles de mutation \u00e0 grande \u00e9chelle, rendant ainsi possible le test efficace de millions de combinaisons bas\u00e9es sur la m\u00eame liste th\u00e9matique.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi les r\u00e8gles classiques de complexit\u00e9 ne suffisent pas<\/h2>\n\n\n\n<p>La plupart des politiques d&#8217;approbation de mots de passe exigent encore :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Au moins un caract\u00e8re majuscule<\/li>\n\n\n\n<li>Au moins un chiffre<\/li>\n\n\n\n<li>Au moins un caract\u00e8re sp\u00e9cial.<\/li>\n<\/ul>\n\n\n\n<p>Le probl\u00e8me est que ces r\u00e8gles sont faciles \u00e0 satisfaire et m\u00eame des mots de passe construits \u00e0 partir de termes sensibles, mais modifi\u00e9s superficiellement, peuvent respecter les exigences de complexit\u00e9. Par exemple, le mot de passe<\/p>\n\n\n\n<p> <code>NumeCompanie123!<\/code> est long et respecte tous les crit\u00e8res techniques, mais reste extr\u00eamement pr\u00e9visible si l&#8217;attaquant dispose d&#8217;une base d&#8217;informations sur l&#8217;organisation concern\u00e9e.<\/p>\n\n\n\n<p>Selon les analyses r\u00e9alis\u00e9es sur des milliards de <a href=\"https:\/\/specopssoft.com\/blog\/new-research-6-billion-compromised-passwords-2026\/\">mots de passe compromis<\/a>, de tels choix sont fr\u00e9quents et faciles \u00e0 exploiter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment se d\u00e9fendre efficacement<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u00c9viter les mots de passe bas\u00e9s sur le langage contextuel<\/h3>\n\n\n\n<p>Les r\u00e8gles de politique devraient aller au-del\u00e0 des exigences de complexit\u00e9 de base et emp\u00eacher l&#8217;utilisation :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Du nom de l&#8217;entreprise ou du syst\u00e8me<\/li>\n\n\n\n<li>Des noms de projets internes<\/li>\n\n\n\n<li>Des termes de l&#8217;industrie<\/li>\n\n\n\n<li>Des variables claires ou faciles \u00e0 associer \u00e0 l&#8217;organisation.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Bloquer les mots de passe d\u00e9j\u00e0 compromis<\/h3>\n\n\n\n<p>Une pratique moderne consiste \u00e0 bloquer les mots de passe d\u00e9j\u00e0 trouv\u00e9s dans des fuites de donn\u00e9es connues. Cela emp\u00eache la r\u00e9utilisation des m\u00eames mots compromis, m\u00eame s&#8217;ils respectent les exigences de complexit\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Cr\u00e9er des mots de passe longs et r\u00e9els (passphrase)<\/h3>\n\n\n\n<p>Les mots de passe sous forme de phrases longues (15+ caract\u00e8res), form\u00e9es de mots non apparent\u00e9s, sont consid\u00e9rablement plus difficiles \u00e0 deviner, m\u00eame pour des attaques cibl\u00e9es.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Activer l&#8217;authentification multi-facteurs (MFA)<\/h3>\n\n\n\n<p>Le MFA n&#8217;emp\u00eache pas la compromission d&#8217;un mot de passe, mais r\u00e9duit significativement le risque qu&#8217;un attaquant utilise le mot de passe compromis pour obtenir un acc\u00e8s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Les attaques bas\u00e9es sur la d\u00e9duction ne reposent pas toujours sur des algorithmes d&#8217;IA avanc\u00e9s ; parfois, les m\u00e9thodes les plus efficaces sont les plus simples, mais bien adapt\u00e9es au contexte. En g\u00e9n\u00e9rant des listes de mots sp\u00e9cifiques au langage et \u00e0 la terminologie d&#8217;une organisation, les attaquants peuvent deviner les mots de passe avec un taux de succ\u00e8s beaucoup plus \u00e9lev\u00e9 que s&#8217;ils utilisaient uniquement des listes g\u00e9n\u00e9riques de mots de passe.<\/p>\n\n\n\n<p>Pour vous prot\u00e9ger correctement, il est essentiel d&#8217;impl\u00e9menter des <a href=\"https:\/\/computershop.eu\/blog\/fr\/quest-ce-quun-gestionnaire-de-mots-de-passe-et-comment-ca-fonctionne\" target=\"_blank\" rel=\"noreferrer noopener\">politiques de s\u00e9curit\u00e9<\/a> ax\u00e9es sur la pr\u00e9vention de l&#8217;utilisation de mots pr\u00e9visibles, de bloquer les mots compromis et d&#8217;appliquer l&#8217;authentification multi-facteurs l\u00e0 o\u00f9 c&#8217;est possible.<\/p>\n\n\n\n<p>Source : <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/password-guessing-without-ai-how-attackers-build-targeted-wordlists\" target=\"_blank\" rel=\"noreferrer noopener\">bleepingcomputer.com<\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/computershop.eu\/fr\/ordinateur-portable-reconditionne-dell-latitude-5520-intel-core-i5-1135g7-2-40-4-20ghz-8gb-ddr4-256gb-ssd-15-6-pouces-full-hd-webcam-windows-11-pro\" target=\"_blank\" rel=\" noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"705\" src=\"https:\/\/computershop.eu\/blog\/wp-content\/uploads\/2026\/02\/75152-dell-latitude-5520-1-1024x705.jpg\" alt=\"Ordinateur portable reconditionn\u00e9 Dell Latitude 5520, Intel Core i5-1135G7\" class=\"wp-image-3034\" style=\"aspect-ratio:1.4376760692203563;width:542px;height:auto\" srcset=\"https:\/\/computershop.eu\/blog\/wp-content\/uploads\/2026\/02\/75152-dell-latitude-5520-1-1024x705.jpg 1024w, https:\/\/computershop.eu\/blog\/wp-content\/uploads\/2026\/02\/75152-dell-latitude-5520-1-300x207.jpg 300w, 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sophistiqu\u00e9es comme l&#8217;intelligence artificielle pour la protection des comptes. Cependant, les attaquants n&#8217;ont pas n\u00e9cessairement besoin &hellip; <a href=\"https:\/\/computershop.eu\/blog\/fr\/comment-les-hackers-deduisent-ils-les-mots-de-passe-sans-laide-de-lia\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":3036,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[178],"tags":[7220,9904,9901,9974,9909,7274,7223,5904,9028,4233,648],"class_list":["post-3039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriels","tag-cyberattaque","tag-devinette-des-mots-de-passe","tag-generateur-de-listes-de-mots-personnalisees","tag-hashcat-fr","tag-listes-de-mots-ciblees","tag-mot-de-passe","tag-piratage","tag-securite-des-donnees","tag-securite-en-ligne","tag-securite-informatique","tag-technologie-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Comment les mots de passe sont-ils devin\u00e9s sans l&#039;aide de l&#039;IA ??<\/title>\n<meta name=\"description\" content=\"Deviner les mots de passe sans l&#039;aide de l&#039;IA\u00a0; 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