{"id":2305,"date":"2026-04-25T03:33:08","date_gmt":"2026-04-25T03:33:08","guid":{"rendered":"https:\/\/global.livebitcoinnews.com\/fr\/2026\/04\/25\/un-test-quantique-brise-la-cle-ecc-souleve-de-nouvelles-inquietudes-sur-la-securite-de-bitcoin\/"},"modified":"2026-04-25T03:33:08","modified_gmt":"2026-04-25T03:33:08","slug":"un-test-quantique-brise-la-cle-ecc-souleve-de-nouvelles-inquietudes-sur-la-securite-de-bitcoin","status":"publish","type":"post","link":"https:\/\/global.livebitcoinnews.com\/fr\/2026\/04\/25\/un-test-quantique-brise-la-cle-ecc-souleve-de-nouvelles-inquietudes-sur-la-securite-de-bitcoin\/","title":{"rendered":"Un test quantique brise la cl\u00e9 ECC, soul\u00e8ve de nouvelles inqui\u00e9tudes sur la s\u00e9curit\u00e9 de Bitcoin"},"content":{"rendered":"

Un chercheur brise une cl\u00e9 ECC \u00e0 l’aide de mat\u00e9riel quantique, suscitant des inqui\u00e9tudes quant \u00e0 la s\u00e9curit\u00e9 de Bitcoin et exhortant \u00e0 une transition plus rapide vers des syst\u00e8mes de protection post-quantiques.<\/i><\/b><\/p>\n

Une avanc\u00e9e dans le calcul quantique a suscit\u00e9 de s\u00e9rieuses pr\u00e9occupations en mati\u00e8re de cybers\u00e9curit\u00e9 dans le monde entier. Giancarlo Lelli, un chercheur ind\u00e9pendant, a r\u00e9cemment cass\u00e9 une cl\u00e9 \u00e0 courbe elliptique de 15 bits avec du mat\u00e9riel quantique public. De plus, cet exploit lui a valu une r\u00e9compense de 1 Bitcoin et une attention mondiale.<\/span><\/p>\n

Une perc\u00e9e quantique montre des progr\u00e8s r\u00e9els dans les attaques cryptographiques<\/b><\/h2>\n

L’exp\u00e9rience faisait partie d’un d\u00e9fi lanc\u00e9 par <\/span>Project Eleven<\/span><\/a>. Le groupe a d\u00e9cern\u00e9 le Q-Day Prize \u00e0 Lelli pour avoir accompli la t\u00e2che avec succ\u00e8s. Il s’agit de la plus grande d\u00e9monstration publique d’une attaque quantique contre la cryptographie \u00e0 courbe elliptique.<\/span><\/p>\n

Lecture connexe : <\/i><\/b>Le d\u00e9bat sur la strat\u00e9gie quantique de Bitcoin s’intensifie<\/i><\/b><\/a><\/p>\n

La cryptographie \u00e0 courbe elliptique (ECC) est utilis\u00e9e pour s\u00e9curiser de nombreux syst\u00e8mes de blockchain. Bitcoin et Ethereum utilisent cette m\u00e9thode pour les signatures, par exemple. Ainsi, casser une petite cl\u00e9 ECC est un pas vers de meilleures attaques quantiques.<\/span><\/p>\n

Lelli a appliqu\u00e9 un algorithme quantique appel\u00e9 l’algorithme de Shor. Cet algorithme est dirig\u00e9 contre le probl\u00e8me du logarithme discret sur courbe elliptique (ECDLP), qui s\u00e9curise les portefeuilles de cryptomonnaies. Cela lui a permis d’obtenir une cl\u00e9 priv\u00e9e \u00e0 partir d’une cl\u00e9 publique.<\/span><\/p>\n

Bien que l’exp\u00e9rience ait \u00e9t\u00e9 men\u00e9e sur une cl\u00e9 de 15 bits, elle est significative. L’espace de cl\u00e9s contenait 32 767 cl\u00e9s possibles, qui ont \u00e9t\u00e9 recherch\u00e9es. Par cons\u00e9quent, ceci est d\u00e9sormais consid\u00e9r\u00e9 comme une am\u00e9lioration par rapport aux tests pr\u00e9c\u00e9dents.<\/span><\/p>\n

En effet, un test en 2025 n’avait cass\u00e9 qu’une cl\u00e9 de 6 bits. Ainsi, cette nouvelle exp\u00e9rience est 512 fois plus sophistiqu\u00e9e. Elle d\u00e9montre l’am\u00e9lioration rapide de la technologie quantique.<\/span><\/p>\n

Des risques croissants poussent au besoin de s\u00e9curit\u00e9 post-quantique<\/b><\/h2>\n

Cependant, il est encore beaucoup plus difficile de casser une cl\u00e9 de 256 bits. Cependant, des \u00e9tudes r\u00e9centes sugg\u00e8rent que l’\u00e9cart se r\u00e9duit rapidement. Les estimations montrent d\u00e9sormais qu’environ 500 000 qubits pourraient \u00eatre n\u00e9cessaires pour une telle attaque.<\/span><\/p>\n

Certaines recherches plus r\u00e9centes sugg\u00e8rent m\u00eame que l’exigence pourrait encore baisser \u00e0 10 000 qubits. Ainsi, on pense que le probl\u00e8me devient davantage un probl\u00e8me d’ing\u00e9nierie. Cela pourrait permettre de futures attaques.<\/span><\/p>\n

Il y a actuellement 6,9 millions de Bitcoins stock\u00e9s dans des portefeuilles avec des cl\u00e9s publiques. Ces portefeuilles pourraient \u00eatre \u00e0 risque si les attaques quantiques deviennent plus efficaces. Par cons\u00e9quent, l’industrie de la cryptomonnaie surveille de pr\u00e8s ces d\u00e9veloppements.<\/span><\/p>\n

De plus, la valeur des actifs prot\u00e9g\u00e9s par l’ECC est de plus de 2 500 milliards de dollars dans le monde. Cela inclut de nombreux <\/span>r\u00e9seaux blockchain<\/span><\/a>. Ainsi, les menaces ne se limitent pas \u00e0 une seule cryptomonnaie.<\/span><\/p>\n

L’industrie technologique prend \u00e9galement ces risques au s\u00e9rieux. D’autres se pr\u00e9parent d\u00e9j\u00e0 \u00e0 des syst\u00e8mes r\u00e9sistants aux quantiques. Par exemple, Google pr\u00e9voit d’\u00eatre r\u00e9sistant aux quantiques d’ici 2029.<\/span><\/p>\n

Maintenant, les experts exhortent \u00e0 la n\u00e9cessit\u00e9 de la cryptographie post-quantique. Il s’agit d’une cryptographie r\u00e9sistante aux ordinateurs quantiques. Ainsi, les d\u00e9veloppeurs devront probablement mettre \u00e0 niveau les syst\u00e8mes de blockchain dans un avenir proche.<\/span><\/p>\n

Pendant ce temps, les chercheurs travaillent sur de nouveaux probl\u00e8mes dans ce domaine. Project Eleven envisage d\u00e9j\u00e0 de mener davantage de tests en utilisant l’intelligence artificielle et l’analyse quantique. Ces efforts visent \u00e0 mieux comprendre et r\u00e9duire les risques futurs.<\/span><\/p>\n

Dans l’ensemble, la cassure de la cl\u00e9 de 15 bits montre les progr\u00e8s de l’informatique quantique. Bien que les attaques \u00e0 grande \u00e9chelle ne soient pas encore r\u00e9alisables, la trajectoire est claire. Par cons\u00e9quent, une pr\u00e9paration pr\u00e9coce et des syst\u00e8mes de s\u00e9curit\u00e9 plus robustes seront essentiels pour l’avenir des march\u00e9s de cryptomonnaies.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Un chercheur brise une cl\u00e9 ECC \u00e0 l’aide de mat\u00e9riel quantique, suscitant des inqui\u00e9tudes quant \u00e0 la s\u00e9curit\u00e9 de Bitcoin et exhortant \u00e0 une transition plus rapide vers des syst\u00e8mes de protection post-quantiques. Une avanc\u00e9e dans le calcul quantique a suscit\u00e9 de s\u00e9rieuses pr\u00e9occupations en mati\u00e8re de cybers\u00e9curit\u00e9 dans le monde entier. Giancarlo Lelli, un […]<\/p>\n","protected":false},"author":6,"featured_media":2304,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-2305","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitcoin-news"],"acf":[],"yoast_head":"\nUn test quantique brise la cl\u00e9 ECC, soul\u00e8ve de nouvelles inqui\u00e9tudes sur la s\u00e9curit\u00e9 de Bitcoin - France Live Bitcoin News<\/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:\/\/global.livebitcoinnews.com\/fr\/2026\/04\/25\/un-test-quantique-brise-la-cle-ecc-souleve-de-nouvelles-inquietudes-sur-la-securite-de-bitcoin\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un test quantique brise la cl\u00e9 ECC, soul\u00e8ve de nouvelles inqui\u00e9tudes sur la s\u00e9curit\u00e9 de Bitcoin - France Live Bitcoin News\" \/>\n<meta property=\"og:description\" content=\"Un chercheur brise une cl\u00e9 ECC \u00e0 l’aide de mat\u00e9riel quantique, suscitant des inqui\u00e9tudes quant \u00e0 la s\u00e9curit\u00e9 de Bitcoin et exhortant \u00e0 une transition plus rapide vers des syst\u00e8mes de protection post-quantiques. 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