{"id":571,"date":"2024-07-23T10:45:10","date_gmt":"2024-07-23T08:45:10","guid":{"rendered":"https:\/\/vaubanlabs.com\/?p=571"},"modified":"2024-07-24T10:30:16","modified_gmt":"2024-07-24T08:30:16","slug":"web3deaaz-hash","status":"publish","type":"post","link":"https:\/\/vaubanlabs.com\/index.php\/2024\/07\/23\/web3deaaz-hash\/","title":{"rendered":"\ud83c\udf10\ud83d\udd24 #Web3DeA\u00e0Z : H comme Hash \ud83d\udd22"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/i0.wp.com\/vaubanlabs.com\/wp-content\/uploads\/2024\/07\/Hash.jpg?resize=500%2C500&#038;ssl=1\" alt=\"repr\u00e9sentation imag\u00e9e du hash\" class=\"wp-image-572\" style=\"width:253px;height:auto\" srcset=\"https:\/\/i0.wp.com\/vaubanlabs.com\/wp-content\/uploads\/2024\/07\/Hash.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/vaubanlabs.com\/wp-content\/uploads\/2024\/07\/Hash.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/vaubanlabs.com\/wp-content\/uploads\/2024\/07\/Hash.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/vaubanlabs.com\/wp-content\/uploads\/2024\/07\/Hash.jpg?resize=100%2C100&amp;ssl=1 100w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n<p>Bienvenue dans notre s\u00e9rie quotidienne o\u00f9 nous explorons l&rsquo;univers du Web3, une lettre \u00e0 la fois. Aujourd&rsquo;hui, nous continuons avec la lettre \u00ab\u00a0H\u00a0\u00bb pour \u00ab\u00a0Hash\u00a0\u00bb.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hash \ud83d\udd22<\/h3>\n\n\n\n<p>Un <strong>hash<\/strong> est une valeur num\u00e9rique g\u00e9n\u00e9r\u00e9e par un algorithme de hachage qui transforme une entr\u00e9e de donn\u00e9es (de n&rsquo;importe quelle taille) en une sortie de longueur fixe. Ils jouent un r\u00f4le crucial dans la s\u00e9curit\u00e9 et l&rsquo;int\u00e9grit\u00e9 des donn\u00e9es sur la blockchain.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fonctionnement<\/h3>\n\n\n\n<p><strong>Algorithme de Hachage<\/strong> : Un processus math\u00e9matique qui prend une entr\u00e9e (ou \u00ab\u00a0message\u00a0\u00bb) et renvoie une cha\u00eene fixe de caract\u00e8res, g\u00e9n\u00e9ralement sous forme de nombres hexad\u00e9cimaux.<br><br><strong>Propri\u00e9t\u00e9s<\/strong> :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>D\u00e9terministe<\/strong> : La m\u00eame entr\u00e9e produit toujours le m\u00eame hash.<\/li>\n\n\n\n<li><strong>Rapide \u00e0 calculer<\/strong> : Il est rapide de calculer le hash d&rsquo;une entr\u00e9e.<\/li>\n\n\n\n<li><strong>Unique<\/strong> : Chaque entr\u00e9e unique devrait id\u00e9alement produire un hash unique.<\/li>\n\n\n\n<li><strong>Inversion impossible<\/strong> : Il est pratiquement impossible de reconstruire l&rsquo;entr\u00e9e d&rsquo;origine \u00e0 partir du r\u00e9sultat.<\/li>\n\n\n\n<li><strong>Sensibilit\u00e9 aux changements<\/strong> : Une modification m\u00eame minime de l&rsquo;entr\u00e9e modifie compl\u00e8tement le hash.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Utilisation dans la Blockchain<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>S\u00e9curit\u00e9 des Donn\u00e9es<\/strong> : Les hashs sont utilis\u00e9s pour prot\u00e9ger les donn\u00e9es en les rendant illisibles sans la cl\u00e9 appropri\u00e9e.<\/li>\n\n\n\n<li><strong>Int\u00e9grit\u00e9 des Transactions<\/strong> : Chaque bloc contient le hash du bloc pr\u00e9c\u00e9dent, cr\u00e9ant une cha\u00eene s\u00e9curis\u00e9e et immuable.<\/li>\n\n\n\n<li><strong>Validation Rapide<\/strong> : Ils permettent de v\u00e9rifier rapidement et efficacement l&rsquo;int\u00e9grit\u00e9 des donn\u00e9es sans les recomposer enti\u00e8rement.<\/li>\n<\/ol>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Exemples de Fonctions de Hachage<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SHA-256<\/strong> : Utilis\u00e9 par Bitcoin, cette fonction de hachage produit une sortie de 256 bits.<\/li>\n\n\n\n<li><strong>Keccak-256<\/strong> : Utilis\u00e9 par Ethereum, \u00e9galement connu sous le nom de SHA-3.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hash Rate \ud83d\udcca<\/h3>\n\n\n\n<p>Le <strong>Hash Rate<\/strong> est la mesure de la puissance de calcul utilis\u00e9e pour miner et s\u00e9curiser les transactions sur une blockchain. Il est g\u00e9n\u00e9ralement exprim\u00e9 en hachages par seconde (H\/s). Lorsqu&rsquo;il est \u00e9lev\u00e9, cel\u00e0 indique une plus grande puissance de calcul dans le r\u00e9seau, rendant la blockchain plus s\u00e9curis\u00e9e contre les attaques.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Importance du Hash Rate<\/strong> :\n<ul class=\"wp-block-list\">\n<li><strong>S\u00e9curit\u00e9<\/strong> : Lorsqu&rsquo;il est plus \u00e9lev\u00e9, il rend les attaques de type 51 % plus difficiles et co\u00fbteuses \u00e0 r\u00e9aliser.<\/li>\n\n\n\n<li><strong>Performance du R\u00e9seau<\/strong> : Un r\u00e9seau avec un hash rate \u00e9lev\u00e9 peut traiter plus de transactions par seconde.<\/li>\n\n\n\n<li><strong>Indicateur de Sant\u00e9<\/strong> : Il est souvent utilis\u00e9 pour \u00e9valuer la sant\u00e9 et la s\u00e9curit\u00e9 d&rsquo;une blockchain.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p>En r\u00e9sum\u00e9, le hash est une des composantes fondamentales qui permettent aux blockchains de fonctionner de mani\u00e8re s\u00e9curis\u00e9e et fiable.<\/p>\n\n\n\n<p>Rendez-vous demain pour d\u00e9couvrir la lettre \u00ab\u00a0I\u00a0\u00bb et un nouveau terme du Web3 ! \ud83d\ude80<\/p>\n\n\n\n<p>Retrouvez toutes ces notions dans nos formations : <a href=\"https:\/\/vaubanlabs.com\/index.php\/boutique\/\">https:\/\/vaubanlabs.com\/index.php\/boutique\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bienvenue dans notre s\u00e9rie quotidienne o\u00f9 nous explorons l&rsquo;univers du Web3, une lettre \u00e0 la fois. Aujourd&rsquo;hui, nous continuons avec la lettre \u00ab\u00a0H\u00a0\u00bb pour \u00ab\u00a0Hash\u00a0\u00bb. Hash \ud83d\udd22 Un hash est<\/p>\n<p><a href=\"https:\/\/vaubanlabs.com\/index.php\/2024\/07\/23\/web3deaaz-hash\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\">\ud83c\udf10\ud83d\udd24 #Web3DeA\u00e0Z : H comme Hash \ud83d\udd22<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":572,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-571","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\ud83c\udf10\ud83d\udd24 #Web3DeA\u00e0Z : H comme Hash \ud83d\udd22 - VaubanLabs<\/title>\n<meta name=\"description\" content=\"Bienvenue dans notre s\u00e9rie quotidienne o\u00f9 nous explorons l&#039;univers du Web3, une lettre \u00e0 la fois. 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