{"id":10452,"date":"2024-11-27T09:16:43","date_gmt":"2024-11-27T08:16:43","guid":{"rendered":"https:\/\/web3factory.net\/fr\/posts\/"},"modified":"2025-02-14T16:31:23","modified_gmt":"2025-02-14T15:31:23","slug":"le-hashing","status":"publish","type":"post","link":"https:\/\/web3factory.net\/fr\/posts\/le-hashing\/","title":{"rendered":"Le Hashing\u00a0"},"content":{"rendered":"<span class=\"simplefavorite-button\" data-postid=\"10452\" data-siteid=\"1\" data-groupid=\"1\" data-favoritecount=\"1\" style=\"box-shadow:none;-webkit-box-shadow:none;-moz-box-shadow:none;\"><label class=\"favoritebtn\"><i aria-hidden=\"true\" class=\"fas fa-bookmark favoritesize\"><\/i><span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-custom\">\u200e\u200e \u200e \u200e Ajouter \u00e0 ma list\u200ee \u200e \u200e <\/span><\/label><\/span>\n<p>Le hashing (ou hashing en anglais) joue un r\u00f4le cl\u00e9 dans la s\u00e9curisation des transactions en crypto. Si vous \u00eates un tant soit peu curieux, vous avez d\u00e9j\u00e0 peut-\u00eatre remarqu\u00e9 en explorant le Web3 ces fameux <span tabindex='0' class='glossary-item-container'>hash<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Hash<\/span> <span class='glossary-item-description'>Fonction cryptographique qui convertit les donn\u00e9es d'entr\u00e9e en une cha\u00eene alphanum\u00e9rique de taille fixe.<\/span><\/span><\/span> de transaction ou hash de bloc. Peut-\u00eatre avez-vous m\u00eame lu quelque part, sans trop d\u2019explications, que ce sont eux qui permettent de s\u00e9curiser une grande partie des diff\u00e9rentes <span tabindex='0' class='glossary-item-container'>blockchain<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Blockchain<\/span> <span class='glossary-item-description'>Un registre public et immuable de transactions cryptographiques, organis\u00e9 en blocs.<\/span><\/span><\/span> en activit\u00e9 aujourd\u2019hui.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ca-veut-dire-quoi-hacher\"><strong>\u00c7a veut dire quoi hacher ?<\/strong><\/h2>\n\n\n\n<p>Ce que l\u2019on nomme <strong>\u2018hashing\u2019 <\/strong>d\u00e9finit simplement une fonction math\u00e9matique ou un algorithme avec pour entr\u00e9e un certain type de donn\u00e9es (Une phrase, un livre entier, des donn\u00e9es de transactions) et qui nous retourne en sortie une suite de caract\u00e8re d\u2019une longueur fixe<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfJ9Pg6UzpK6cy4KRtFKiWOb82SNywfg0gYO35XqPMrh8j-H9waxfY6YuUMDgkbqj7qTakK76gP5nJNIBHkQaMzOkDET4ovypIcwtLoz3Dxmr2WbcPysbiAxDTiX1zbEe55lBU5qw?key=w7nase3fGvFzgiZj3ZQ4mtyW\" alt=\"\"\/><\/figure>\n\n\n\n<p>Les fonctions de hashing ont pour principal objectif de s\u00e9curiser le transfert de donn\u00e9es ou d&rsquo;informations entre deux syst\u00e8mes qui, par d\u00e9faut, ne poss\u00e8dent aucun moyen de garantir la s\u00e9curit\u00e9 de l&rsquo;\u00e9change. Il existe de nombreux algorithmes de hashing ,la fonction par exemple l\u2019algorithme de hashing SHA-256 est particuli\u00e8rement c\u00e9l\u00e8bre, notamment dans son utilisation par la Blockchain <strong>Bitcoin <\/strong>pour assurer une s\u00e9curit\u00e9 totale des transactions et des \u00e9changes.<\/p>\n\n\n\n<p>La particularit\u00e9 du hashing est en premier lieu son principe d\u2019irr\u00e9versibilit\u00e9, un algorithme de hashing peut prendre une donn\u00e9es entrante et la convertir en Hash mais un Hash ne peut pas nous d\u00e9voiler la donn\u00e9es utilis\u00e9e au d\u00e9but.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-un-exemple-de-hashing\"><strong>Un exemple de hashing<\/strong><\/h3>\n\n\n\n<p>Pour mieux comprendre comment le hashing s\u00e9curise les \u00e9changes, voyons un exemple simple<\/p>\n\n\n\n<p>Imaginons que deux individus, Sam et Caroline, \u00e9changent un message contenant des informations cruciales qu\u2019ils souhaitent prot\u00e9ger contre toute modification ou interception par un tiers.<\/p>\n\n\n\n<p>Sam pourrait apr\u00e8s avoir re\u00e7u son message fournir le hash \u00e0 Caroline et si Caroline parviens \u00e0 trouver le m\u00eame hash sur le message re\u00e7u cela veut dire qu\u2019ils ont bien re\u00e7u le m\u00eame message et qu\u2019il n&rsquo;a pas \u00e9t\u00e9 alt\u00e9r\u00e9.<\/p>\n\n\n\n<p>Ou encore plus simple, par mesure de s\u00e9curit\u00e9 le hashing est utilis\u00e9 par les sites web afin de stocker votre mot de passe.<\/p>\n\n\n\n<p>Imaginez que vous cr\u00e9ez un compte sur un site web. Au lieu de stocker votre mot de passe tel quel (ex. : \u00ab\u00a0123456\u00a0\u00bb), le site applique une fonction de hashing qui transforme ce mot de passe en une suite de caract\u00e8res comme : \u00ab\u00a0e10adc3949ba59abbe56e057f20f883e\u00a0\u00bb. Si quelqu\u2019un vole la base de donn\u00e9es, il ne pourra pas utiliser directement vos mots de passe. Cette m\u00e9thode est essentielle pour r\u00e9duire les risques en cas de cyberattaque, et lorsque vous souhaitez vous connecter on applique la fonction de hashing au mot de passe fourni et on compare les deux hash s&rsquo; ils sont similaires vous avez tap\u00e9 le bon mot de passe.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-et-la-blockchain-dans-tout-ca\"><strong>Et la blockchain dans tout \u00e7a ?<\/strong><\/h2>\n\n\n\n<p>Maintenant que nous comprenons comment le hashing s\u00e9curise les \u00e9changes, voyons comment il est utilis\u00e9 pour garantir la s\u00e9curit\u00e9 et l\u2019int\u00e9grit\u00e9 des blockchains.<\/p>\n\n\n\n<p>L\u2019irr\u00e9versibilit\u00e9, l\u2019anonymisation c\u2019est bien beau ! Mais concr\u00e8tement o\u00f9 est-ce que l\u2019on s\u2019en sert lorsqu&rsquo;on traite avec une blockchain comme Bitcoin ?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-creation-et-liaison-des-blocs\"><strong>Cr\u00e9ation et liaison des blocs<\/strong><\/h3>\n\n\n\n<p>Chaque bloc d&rsquo;une blockchain contient un ensemble de transactions. Pour garantir que ces blocs soient s\u00e9curis\u00e9s et reli\u00e9s entre eux de fa\u00e7on immuable, chaque bloc comprend un <strong>hashing unique<\/strong> calcul\u00e9 \u00e0 partir des donn\u00e9es qu&rsquo;il contient, ainsi que le hashing du bloc pr\u00e9c\u00e9dent. Cette structure en cha\u00eene garantit que si quelqu&rsquo;un modifie les donn\u00e9es dans un bloc, le hashing de ce bloc change \u00e9galement. Par cons\u00e9quent, tous les blocs suivants seraient affect\u00e9s, rendant toute tentative de falsification rapidement identifiable.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXc6at1CfWMS5XsuUvNG-Tj4ed81Eq1lHpvUtPRNgvROUduHzDxjYFzg65pXP3Y5_PsFhdVmnRdwqLqvEIpPZOgoDSpYoj0tvn7cHyyrZuc_QDGbADYFex01TMP9xgv786IQkm1w?key=w7nase3fGvFzgiZj3ZQ4mtyW\" alt=\"\"\/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-validation-des-transactions\"><strong>Validation des transactions<\/strong><\/h3>\n\n\n\n<p>Les mineurs sur la blockchain utilisent des fonctions de hashing pour valider les transactions et cr\u00e9er de nouveaux blocs. Lors du processus de minage, un mineur doit trouver un nombre sp\u00e9cial, appel\u00e9 <strong>nonce<\/strong>, qui, lorsqu&rsquo;il est combin\u00e9 aux donn\u00e9es du bloc et pass\u00e9 dans la fonction de hashing (comme SHA-256), produit un hashing qui respecte certaines conditions pr\u00e9d\u00e9finies (un nombre de z\u00e9ros au d\u00e9but, par exemple).<\/p>\n\n\n\n<p>Ce processus est au centre du m\u00e9canisme de <span tabindex='0' class='glossary-item-container'>consensus<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Consensus<\/span> <span class='glossary-item-description'>Un accord entre les participants \u00e0 la blockchain sur la validit\u00e9 des transactions. Il s'agit d'un concept cl\u00e9, essentiel pour garantir que tous les n\u0153uds d'une cha\u00eene partagent les m\u00eames informations.<\/span><\/span><\/span> connu sous le nom de <strong><span tabindex='0' class='glossary-item-container'>Proof of Work<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Proof of Work<\/span> <span class='glossary-item-description'>M\u00e9canisme de consensus dans lequel les mineurs s'affrontent pour r\u00e9soudre des probl\u00e8mes math\u00e9matiques complexes afin de valider les transactions et de s\u00e9curiser le r\u00e9seau.<\/span><\/span><\/span> (PoW)<\/strong>. Le hashing rend le minage difficile et consommateur de ressources, ce qui prot\u00e8ge le r\u00e9seau contre les attaques tout en assurant l&rsquo;int\u00e9grit\u00e9 et l&rsquo;ordre des transactions.<\/p>\n\n\n\n<p>Gr\u00e2ce \u00e0 l&rsquo;<strong>irr\u00e9versibilit\u00e9<\/strong> des fonctions de hashing, une fois qu&rsquo;une transaction est incluse dans un bloc et valid\u00e9e par le r\u00e9seau, il est pratiquement impossible de la modifier. Toute tentative de modification n\u00e9cessiterait de recalculer le hashing de ce bloc et de tous les blocs suivants, une t\u00e2che presque impossible \u00e0 r\u00e9aliser, car cela demanderait une puissance de calcul colossale d\u00e9passant celle du reste du r\u00e9seau.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXe-fgxQVSJF_khX6VjsZjbl6BZ1j3xChCcJGwXOIBWIA5aNBdPBx5mGsMMeiQuBUcTJ2lFwOuFxzirkoGWmgd4TLYnQ1onyQ6nj7jUHZPnCgnMwFJNLqOXzTSGTjvzNf8CEX7Dm?key=w7nase3fGvFzgiZj3ZQ4mtyW\" alt=\"\" style=\"width:724px;height:auto\"\/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-proof-of-work-et-sha-256\"><strong>Proof of Work et SHA-256<\/strong><\/h3>\n\n\n\n<p>Le Bitcoin, par exemple, utilise la fonction de hashing <strong>SHA-256<\/strong> pour le minage. Cette fonction garantit que chaque entr\u00e9e produit un hashing de longueur fixe et qu&rsquo;une petite modification de l&rsquo;entr\u00e9e entra\u00eene un hashing totalement diff\u00e9rent. C&rsquo;est ce qui rend la blockchain si fiable et s\u00e9curis\u00e9e. En trouvant un nonce qui permet de produire un hashing conforme aux r\u00e8gles du r\u00e9seau, les mineurs ajoutent de nouveaux blocs et re\u00e7oivent des r\u00e9compenses en Bitcoin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-l-epine-dorsale-de-la-securite-blockchain\"><strong>L&rsquo;\u00e9pine dorsale de la s\u00e9curit\u00e9 blockchain<\/strong><\/h2>\n\n\n\n<p>Le hashing, avec ses caract\u00e9ristiques d&rsquo;irr\u00e9versibilit\u00e9 et d&rsquo;unicit\u00e9, constitue une technologie essentielle qui garantit l&rsquo;int\u00e9grit\u00e9, la transparence et la s\u00e9curit\u00e9 des blockchains. Il relie les blocs, s\u00e9curise les transactions, et prot\u00e8ge le r\u00e9seau contre les attaques. Sans le hashing, l\u2019\u00e9cosyst\u00e8me Web3, les cryptomonnaies, et les nombreux cas d\u2019usage de la blockchain ne pourraient fonctionner avec la fiabilit\u00e9 que nous connaissons aujourd\u2019hui.<\/p>\n\n\n\n<p>Alors que l&rsquo;usage des blockchains continue de se diversifier dans des secteurs tels que la finance et la logistique, le hashing reste un pilier technologique central. Comprendre cette m\u00e9canique, c&rsquo;est mieux appr\u00e9hender l&rsquo;avenir de la s\u00e9curit\u00e9 num\u00e9rique et des \u00e9changes d\u00e9centralis\u00e9s.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez comment le hashing garantit l&rsquo;int\u00e9grit\u00e9 des donn\u00e9es et la s\u00e9curit\u00e9 immuable des blockchains. Gr\u00e2ce \u00e0 des fonctions cryptographiques comme le SHA-256, chaque transaction est verrouill\u00e9e dans un bloc, rendant toute falsification impossible.<\/p>\n","protected":false},"author":43,"featured_media":13237,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[111],"tags":[],"class_list":["post-10452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchains"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v23.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le Hashing\u00a0 - Web3Factory<\/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:\/\/web3factory.net\/fr\/posts\/le-hashing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le Hashing\u00a0\" \/>\n<meta property=\"og:description\" content=\"D\u00e9couvrez comment le hashing garantit l&#039;int\u00e9grit\u00e9 des donn\u00e9es et la s\u00e9curit\u00e9 immuable des blockchains. 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