{"id":16046,"date":"2026-11-11T15:17:24","date_gmt":"2026-11-11T14:17:24","guid":{"rendered":"https:\/\/dailyai.com\/?p=16046"},"modified":"2026-11-11T15:17:24","modified_gmt":"2026-11-11T14:17:24","slug":"a-five-person-team-and-ai-proved-signals-code-in-four-weeks","status":"publish","type":"post","link":"https:\/\/dailyai.com\/fr\/2026\/11\/a-five-person-team-and-ai-proved-signals-code-in-four-weeks\/","title":{"rendered":"Une \u00e9quipe de cinq personnes et l'IA ont prouv\u00e9 le code de Signal en quatre semaines"},"content":{"rendered":"

Quatre semaines. C'est le temps qu'il a fallu \u00e0 une \u00e9quipe de cinq personnes de Google DeepMind, travaillant avec des agents d'IA, pour produire des preuves v\u00e9rifi\u00e9es par machine des propri\u00e9t\u00e9s de s\u00e9curit\u00e9 essentielles du code compil\u00e9 de la biblioth\u00e8que de messagerie principale de Signal. Ces preuves repr\u00e9sentent environ 6,5 millions de lignes de code. Des travaux similaires men\u00e9s pr\u00e9c\u00e9demment sur d'autres syst\u00e8mes avaient n\u00e9cessit\u00e9 des ann\u00e9es de travail de sp\u00e9cialistes et, g\u00e9n\u00e9ralement, l'\u00e9criture du code \u00e0 prouver.<\/strong><\/p>\n\n\n\n

L\u2019article de recherche, dat\u00e9 du 10 novembre 2026, expose la m\u00e9thode et ses limites.<\/a> Le document technique qui accompagne ce document pr\u00e9sente ces chiffres plus en d\u00e9tail.<\/a> Ce travail ne constitue pas une preuve de l'application Signal dans son ensemble, ni d'autres applications utilisant une conception similaire. Il s'agit d'une preuve de propri\u00e9t\u00e9s sp\u00e9cifiques de libsignal, la biblioth\u00e8que de r\u00e9f\u00e9rence, pour les sessions individuelles, traduites en code machine compil\u00e9 ex\u00e9cut\u00e9.<\/p>\n\n\n\n

Ce qui a \u00e9t\u00e9 prouv\u00e9<\/h2>\n\n\n\n

libsignal est la biblioth\u00e8que qui impl\u00e9mente le syst\u00e8me de chiffrement Signal. En clair, ce syst\u00e8me vise \u00e0 garantir la confidentialit\u00e9 d'un message m\u00eame en cas de vol ult\u00e9rieur de la cl\u00e9, et \u00e0 permettre sa r\u00e9cup\u00e9ration apr\u00e8s une br\u00e8ve compromission du syst\u00e8me. Ces deux concepts sont g\u00e9n\u00e9ralement appel\u00e9s confidentialit\u00e9 persistante et s\u00e9curit\u00e9 post-compromission.<\/p>\n\n\n\n

L'\u00e9quipe a compil\u00e9 la biblioth\u00e8que originale (version 0.105.4, ainsi que la crate SPQR associ\u00e9e en version 1.6.0) avec le compilateur Rust standard, pour obtenir un petit outil en ligne de commande fonctionnant sous Linux ARM 64 bits. Les preuves portent sur cet ex\u00e9cutable, et non sur une r\u00e9\u00e9criture optimis\u00e9e. La biblioth\u00e8que v\u00e9rifi\u00e9e p\u00e8se environ 560 Ko, soit environ 140\u00a0000 instructions machine.<\/p>\n\n\n\n

Ils couvrent l'\u00e9tablissement d'une session PQXDH, qui permet \u00e0 deux personnes d'initier une session priv\u00e9e, incluant une \u00e9tape post-quantique con\u00e7ue pour r\u00e9sister aux attaques d'un futur ordinateur quantique, ainsi que le m\u00e9canisme Triple Ratchet, qui g\u00e9n\u00e8re une nouvelle cl\u00e9 pour chaque message. Dans le mod\u00e8le \u00ab symbolique \u00bb, qui consid\u00e8re la cryptographie sous-jacente comme id\u00e9ale, l'article affirme \u00e9galement la confidentialit\u00e9 de l'\u00e9tablissement de la session face \u00e0 une attaque ult\u00e9rieure utilisant un ordinateur quantique. Les discussions de groupe, l'exp\u00e9diteur scell\u00e9 (sealed sender) et le protocole c\u00f4t\u00e9 serveur sont laiss\u00e9s pour des travaux futurs.<\/p>\n\n\n\n

Comment le travail a \u00e9t\u00e9 effectu\u00e9<\/h2>\n\n\n\n

La v\u00e9rification formelle consiste \u00e0 formuler un \u00e9nonc\u00e9 math\u00e9matique pr\u00e9cis du comportement attendu du code, puis \u00e0 prouver que ce dernier s'y conforme. Une seule hypoth\u00e8se erron\u00e9e peut invalider le r\u00e9sultat\u00a0; il est donc indispensable de d\u00e9finir ce qu'il faut prouver et de valider cet \u00e9nonc\u00e9.<\/p>\n\n\n\n

L'article est clair quant \u00e0 la r\u00e9partition des t\u00e2ches. Les humains ont s\u00e9lectionn\u00e9 les propri\u00e9t\u00e9s, lev\u00e9 les ambigu\u00eft\u00e9s et valid\u00e9 le cahier des charges. Des agents ont ensuite r\u00e9dig\u00e9 les preuves. Ces preuves ne sont accept\u00e9es que si Lean, un syst\u00e8me de v\u00e9rification de preuves, les confirme. La fiabilit\u00e9 du r\u00e9sultat, expliquent les auteurs, ne d\u00e9pend pas de la fiabilit\u00e9 des agents de preuve, car le noyau de Lean v\u00e9rifie la logique.<\/p>\n\n\n\n

L'article de recherche indique que les agents de preuve \u00e9taient bas\u00e9s sur Gemini Carbon. Le travail de preuve lui-m\u00eame a \u00e9t\u00e9 r\u00e9alis\u00e9 par cinq chercheurs en quatre semaines, chacun ex\u00e9cutant des agents sur son propre poste de travail. Il s'agit d'une campagne courte pour le domaine. L'article note que le micro-noyau seL4, une v\u00e9rification ant\u00e9rieure bien connue, a n\u00e9cessit\u00e9 vingt ann\u00e9es-personnes, et le compilateur C CompCert, six. Ces deux bases de code ont \u00e9t\u00e9 con\u00e7ues en tenant compte de la preuve. Ce n'\u00e9tait pas le cas de libsignal.<\/p>\n\n\n\n

Les preuves elles-m\u00eames peuvent \u00eatre longues car elles traitent du code machine. Environ 6,5 millions de lignes sont des preuves\u00a0: 5,3 millions concernant le binaire, auxquelles s\u2019ajoutent des fichiers distincts pour les deux mod\u00e8les de s\u00e9curit\u00e9. Un lecteur souhaitant se fier aux affirmations principales doit n\u00e9anmoins consulter les parties fiables\u00a0: environ 18\u00a0000 lignes de sp\u00e9cification dans le d\u00e9p\u00f4t, ainsi qu\u2019environ 8\u00a0000 lignes du mod\u00e8le de code machine Arm et des noms de symboles associ\u00e9s \u00e0 l\u2019ex\u00e9cutable. Les routines cryptographiques de bas niveau, deux fonctions de sortie et quelques appels de biblioth\u00e8que sont implicites, non d\u00e9montr\u00e9s.<\/p>\n\n\n\n

Une v\u00e9rification des anciens bogues<\/h2>\n\n\n\n

Pour v\u00e9rifier la robustesse des affirmations, l'\u00e9quipe a r\u00e9introduit deux bogues pr\u00e9c\u00e9demment d\u00e9couverts par des chercheurs dans libsignal et depuis corrig\u00e9s. Dans les deux cas, ils ont d\u00e9montr\u00e9 que le th\u00e9or\u00e8me de s\u00e9curit\u00e9 symbolique ne s'applique pas au binaire d\u00e9fectueux. Ce test est utile\u00a0: une sp\u00e9cification qui \u201c\u00a0r\u00e9ussit\u00a0\u201d encore sur du code connu pour \u00eatre d\u00e9fectueux serait trop faible.<\/p>\n\n\n\n

L'une de ces failles stockait l'\u00e9tat d'une nouvelle session, y compris une copie d'un secret, alors qu'un message de pr\u00e9-cl\u00e9 n'avait \u00e9t\u00e9 d\u00e9chiffr\u00e9 que dans le cadre d'une session ant\u00e9rieure. L'autre acceptait une n\u00e9gociation dont la cl\u00e9 de base avait \u00e9t\u00e9 alt\u00e9r\u00e9e, cr\u00e9ant ainsi une seconde session avec le m\u00eame secret partag\u00e9.<\/p>\n\n\n\n

Ce que le r\u00e9sultat ne dit pas<\/h2>\n\n\n\n

Les auteurs sont rigoureux et les limites sont importantes. Les preuves ne couvrent pas l'int\u00e9gralit\u00e9 du syst\u00e8me Signal, toutes les attaques possibles, ni m\u00eame les primitives cryptographiques elles-m\u00eames. Les attaques par canaux auxiliaires sont exclues du champ d'application. La preuve computationnelle, qui tente de limiter les chances de succ\u00e8s d'un attaquant r\u00e9el, n'offre aucune garantie contre un adversaire quantique, et sa limite devient inapplicable pour de multiples sessions longues comportant de nombreux tours.<\/p>\n\n\n\n

Des variantes du m\u00eame protocole sont utilis\u00e9es dans WhatsApp, Messenger de Meta et Google Messages, pr\u00e9cise l'article. Ces applications n'\u00e9taient pas l'objet de la d\u00e9monstration. Une d\u00e9monstration concernant libsignal ne s'applique pas automatiquement \u00e0 tous les produits utilisant un langage similaire.<\/p>\n\n\n\n

Ehren Kret, directeur technique de Signal, est cit\u00e9 dans l'article de recherche comme disant que la v\u00e9rification rigoureuse de la mise en \u0153uvre du protocole \u00ab nous donne une confiance encore plus grande dans les garanties de confidentialit\u00e9 de notre code \u00bb.<\/p>\n\n\n\n

Les preuves et les sp\u00e9cifications sont publi\u00e9es dans un d\u00e9p\u00f4t ouvert.<\/a><\/p>\n\n\n\n

Pourquoi c'est important<\/h2>\n\n\n\n

La plupart des personnes qui envoient un message priv\u00e9 n'ont jamais acc\u00e8s \u00e0 la biblioth\u00e8que qui le chiffre. Une m\u00e9thode permettant de v\u00e9rifier le code compil\u00e9 de cette biblioth\u00e8que en quelques semaines plut\u00f4t qu'en plusieurs ann\u00e9es-personnes repr\u00e9sente une avanc\u00e9e majeure dans l'audit de ce type de logiciel. Il ne s'agit pas d'une certification attestant que Signal, ou toute autre application de messagerie instantan\u00e9e, est exempte de failles. C'est un argument, v\u00e9rifi\u00e9 automatiquement, concernant des propri\u00e9t\u00e9s sp\u00e9cifiques d'une biblioth\u00e8que essentielle, produit suffisamment rapidement pour permettre l'audit d'autres parties critiques du code par la suite.<\/p>\n\n\n\n

La plupart des applications de messagerie instantan\u00e9e courantes ne disposent toujours pas d'une telle preuve, et certains outils populaires ne chiffrent m\u00eame pas les messages de bout en bout. Un pr\u00e9c\u00e9dent rapport portait sur un outil de messagerie instantan\u00e9e destin\u00e9 aux consommateurs, qui envoie des SMS sans cette protection.<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Une \u00e9quipe de cinq personnes de Google DeepMind, travaillant avec des agents d'IA, a produit en quatre semaines environ 6,5 millions de lignes de preuves v\u00e9rifi\u00e9es par machine pour la biblioth\u00e8que de messagerie instantan\u00e9e Signal. Ces preuves portent sur des propri\u00e9t\u00e9s sp\u00e9cifiques du code compil\u00e9, et non sur l'application enti\u00e8re.<\/p>","protected":false},"author":16,"featured_media":16047,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-16046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"\nA Five-Person Team and AI Proved Signal\u2019s Code in Four Weeks<\/title>\n<meta name=\"description\" content=\"A five-person DeepMind team and AI agents proved specified properties of Signal\u2019s chat library in four weeks, with 6.5 million lines of checked proofs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dailyai.com\/fr\/2026\/11\/a-five-person-team-and-ai-proved-signals-code-in-four-weeks\/\" \/>\n<meta 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