{"id":2925,"date":"2025-01-08T10:37:11","date_gmt":"2025-01-08T10:37:11","guid":{"rendered":"https:\/\/elusivedata.io\/?p=2925"},"modified":"2025-08-14T19:31:30","modified_gmt":"2025-08-14T19:31:30","slug":"le-decodage-des-variantes-une-competence-essentielle-dans-lanalyse-judiciaire-des-donnees-sqlite","status":"publish","type":"post","link":"https:\/\/elusivedata.io\/fr\/decoding-varints-a-critical-skill-in-sqlite-forensics\/","title":{"rendered":"D\u00e9codage des variantes : Une comp\u00e9tence essentielle dans l'analyse criminelle de SQLite"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2925\" class=\"elementor elementor-2925\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f400ea3 e-flex e-con-boxed e-con e-parent\" data-id=\"f400ea3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-751fdcd elementor-widget elementor-widget-heading\" data-id=\"751fdcd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Introduction<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a11b574 elementor-widget elementor-widget-text-editor\" data-id=\"a11b574\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Ma premi\u00e8re rencontre avec les varints a eu lieu il y a de nombreuses ann\u00e9es lors d'un examen m\u00e9dico-l\u00e9gal num\u00e9rique d'un iPhone 3GS dans le cadre d'une enqu\u00eate sur un meurtre et un incendie criminel.<\/strong> Jusqu'alors, mon travail de police scientifique concernait principalement des t\u00e9l\u00e9phones fonctionnels, en particulier des appareils CDMA fonctionnant sous BREW. Chaque message texte \u00e9tait stock\u00e9 dans son propre fichier, avec un d\u00e9calage coh\u00e9rent et une valeur hexad\u00e9cimale directe indiquant la longueur du message. Il s'agissait d'un processus pr\u00e9visible et familier.<\/p>\n<p>Cependant, l'iPhone m'a confront\u00e9 \u00e0 un tout nouveau d\u00e9fi. Les messages n'\u00e9taient plus stock\u00e9s sous forme de fichiers individuels, mais sous forme d'enregistrements dans une base de donn\u00e9es. Contrairement \u00e0 la simplicit\u00e9 des t\u00e9l\u00e9phones fonctionnels, la longueur d'une cha\u00eene de messages n'\u00e9tait pas d\u00e9finie par une valeur hexad\u00e9cimale claire. Au lieu de cela, je me suis retrouv\u00e9 \u00e0 naviguer dans des bases de donn\u00e9es SQLite et \u00e0 apprendre \u00e0 analyser les donn\u00e9es utiles des enregistrements. C'est l\u00e0 que j'ai rencontr\u00e9 <strong>varints - entiers de longueur variable<\/strong>-une mani\u00e8re compacte et efficace d'encoder des donn\u00e9es. La compr\u00e9hension des varints s'est av\u00e9r\u00e9e cruciale lorsque j'ai d\u00e9m\u00eal\u00e9 la structure de la base de donn\u00e9es et extrait des preuves essentielles. Dans ce cas, la ma\u00eetrise des varints a permis de faire des d\u00e9couvertes incriminantes qui ont finalement contribu\u00e9 \u00e0 la condamnation de l'accus\u00e9 pour incendie criminel et meurtre.<\/p>\n<p>Les varints sont un composant fondamental des bases de donn\u00e9es SQLite, permettant un encodage efficace des nombres entiers qui d\u00e9finissent la longueur des cellules, des enregistrements et des champs sp\u00e9cifiques. Pour les praticiens de la criminalistique num\u00e9rique, le d\u00e9codage des varints est essentiel pour d\u00e9couvrir des informations critiques dans les fichiers de base de donn\u00e9es. Ces entiers compacts jouent un r\u00f4le important dans le mappage des structures des tables, l'identification des enregistrements et la r\u00e9cup\u00e9ration des donn\u00e9es supprim\u00e9es ou cach\u00e9es.<\/p>\n<ul>\n<li>Cet article de blog explore le r\u00f4le vital que jouent les empreintes dans l'analyse forensique de SQLite. Je pr\u00e9senterai <a href=\"https:\/\/elusivedata.io\/fr\/outils-calculatrice-varint\/?v=efad7abb323e\" style=\"\">Calculatrice VarInt<\/a>un outil gratuit con\u00e7u pour simplifier le processus de d\u00e9codage et vous guider \u00e0 travers un tutoriel pour vous aider \u00e0 appliquer ces connaissances dans vos enqu\u00eates. De l'analyse des entr\u00e9es de base de donn\u00e9es SQLite \u00e0 la reconstruction des enregistrements supprim\u00e9s, la compr\u00e9hension des variantes est une comp\u00e9tence que tout examinateur m\u00e9dico-l\u00e9gal devrait avoir dans sa bo\u00eete \u00e0 outils. Si vous souhaitez appliquer ces techniques dans des cas concrets, notre <a href=\"https:\/\/elusivedata.io\/fr\/sqlite-forensics\/?v=efad7abb323e\">Cours Certified SQLite Forensics (en anglais)<\/a> couvre les varints, les freelists, les pages de d\u00e9bordement, et plus encore, \u00e0 travers des laboratoires pratiques et des d\u00e9fis concrets.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ee35c3 elementor-cta--layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-bg-transform elementor-bg-transform-zoom-in elementor-widget elementor-widget-call-to-action\" data-id=\"8ee35c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<a class=\"elementor-cta\" href=\"https:\/\/elusivedata.io\/fr\/sqlite-forensics\/?v=efad7abb323e\">\n\t\t\t\t\t<div class=\"elementor-cta__bg-wrapper\">\n\t\t\t\t<div class=\"elementor-cta__bg elementor-bg\" style=\"background-image: url(https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/06\/SQLite-Forensics-Mobile-Apps-1024x576.jpg);\" role=\"img\" aria-label=\"SQLite forensics dans les applications mobiles telles que Instagram, Telegram, WhatsApp et Messenger - d\u00e9couvrir des donn\u00e9es cach\u00e9es dans des bases de donn\u00e9es r\u00e9elles.\"><\/div>\n\t\t\t\t<div class=\"elementor-cta__bg-overlay\"><\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tApprenez \u00e0 identifier et \u00e0 d\u00e9coder les variantes pour r\u00e9cup\u00e9rer et interpr\u00e9ter les donn\u00e9es critiques des bases de donn\u00e9es SQLite.\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__description elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tNotre formation Certified SQLite Forensics vous permet d'identifier ces entiers compacts, d'interpr\u00e9ter compl\u00e8tement les structures des bases de donn\u00e9es, de r\u00e9cup\u00e9rer les enregistrements supprim\u00e9s et de valider les r\u00e9sultats de l'outil.\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<span class=\"elementor-cta__button elementor-button elementor-size-\">\n\t\t\t\t\t\tEn savoir plus \u2192\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0a9f034 e-flex e-con-boxed e-con e-parent\" data-id=\"0a9f034\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2d15b32 elementor-widget elementor-widget-heading\" data-id=\"2d15b32\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Comprendre les variantes : Les rep\u00e9rer et les d\u00e9coder<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1a5cdd5 elementor-widget elementor-widget-text-editor\" data-id=\"1a5cdd5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour approfondir la connaissance de SQLite et de la criminalistique num\u00e9rique, il est indispensable de comprendre les \u00e9l\u00e9ments suivants <strong>les entiers de longueur variable (varints)<\/strong>. Ces nombres compacts sont omnipr\u00e9sents dans les bases de donn\u00e9es SQLite, car ils permettent au syst\u00e8me d'\u00e9conomiser de l'espace en utilisant le moins d'octets possible pour stocker des valeurs. Mais ils peuvent aussi \u00eatre difficiles \u00e0 rep\u00e9rer et \u00e0 d\u00e9coder si vous ne savez pas ce qu'il faut faire. Voyons cela \u00e9tape par \u00e9tape.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-440d395 elementor-widget elementor-widget-heading\" data-id=\"440d395\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Qu'est-ce qu'un Varint ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0a4ead6 elementor-widget elementor-widget-text-editor\" data-id=\"0a4ead6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Un varint est un moyen sp\u00e9cial de stocker des nombres o\u00f9 la taille du nombre d\u00e9termine le nombre d'octets utilis\u00e9s. Contrairement aux entiers de longueur fixe (par exemple, 4 octets ou 8 octets), un varint peut \u00eatre aussi petit qu'un octet ou aussi grand que 9 octets. Cette flexibilit\u00e9 rend les varints peu encombrants, mais aussi plus difficiles \u00e0 interpr\u00e9ter.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a4470c9 e-flex e-con-boxed e-con e-parent\" data-id=\"a4470c9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b69e6a3 elementor-widget elementor-widget-heading\" data-id=\"b69e6a3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">O\u00f9 trouver les Varints ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1606c9a elementor-widget elementor-widget-text-editor\" data-id=\"1606c9a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Dans les bases de donn\u00e9es SQLite, les varints sont utilis\u00e9s pour encoder :<\/p><ul><li>Longueur des cellules ou des enregistrements dans une page de base de donn\u00e9es.<\/li><li>Les ID de ligne qui identifient les enregistrements de mani\u00e8re unique.<\/li><li>Longueur des donn\u00e9es contenues dans la charge utile d'un enregistrement.<\/li><li>Diverses autres valeurs li\u00e9es \u00e0 la structure de la base de donn\u00e9es.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-313b44c e-flex e-con-boxed e-con e-parent\" data-id=\"313b44c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7398cff elementor-widget elementor-widget-heading\" data-id=\"7398cff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">La cl\u00e9 de la lecture des variantes : Le bit de marquage<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-364928d elementor-widget elementor-widget-text-editor\" data-id=\"364928d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La premi\u00e8re chose que vous devez savoir lorsque vous lisez un varint est comment d\u00e9terminer sa longueur. Chaque octet d'une variable a une valeur <strong>bit de marquage<\/strong> (le bit le plus significatif, ou MSB) qui vous indique s'il y a un autre octet \u00e0 droite qui fait partie de la m\u00eame varint :<\/p><ul><li><strong>Si le bit de marquage est \u00e0 1<\/strong>l'octet suivant fait \u00e9galement partie de la variable.<\/li><li><strong>Si le bit de marquage est \u00e0 0<\/strong>vous avez atteint la fin de la varint.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f2113ff e-flex e-con-boxed e-con e-parent\" data-id=\"f2113ff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8b63438 elementor-widget elementor-widget-heading\" data-id=\"8b63438\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Deux fa\u00e7ons de d\u00e9coder la longueur d'une ligne de d\u00e9marcation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-32573a4 elementor-widget elementor-widget-text-editor\" data-id=\"32573a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Il existe deux m\u00e9thodes pour d\u00e9terminer la longueur d'une variable : la m\u00e9thode longue (en binaire) et la m\u00e9thode facile (en hexad\u00e9cimale). Passons en revue les deux.<\/p><p><strong>Le long chemin : L'utilisation de la m\u00e9thode binaire<\/strong><\/p><ol><li style=\"list-style-type: none;\"><ol><li>Commencez par le premier octet de la variable.<\/li><li>Convertissez l'octet en binaire. Regardez le bit le plus significatif (le bit le plus \u00e0 gauche).<ul><li>Si le bit est \u00e0 1, l'octet de droite fait partie de la variable.<\/li><li>Si le bit est \u00e0 0, vous avez atteint la fin.<\/li><\/ul><\/li><li>R\u00e9p\u00e9tez ce processus pour chaque octet jusqu'\u00e0 ce que vous trouviez un octet avec un MSB de 0.<\/li><\/ol><\/li><\/ol><p><strong>Exemple :<\/strong><\/p><ul><li>Octet : <code>0xC2<\/code> \u2192 Binaire : 11000010 \u2192 MSB : 1 \u2192 Continuer.<\/li><li>Octet : <code>0x7F<\/code> \u2192 Binaire : 01111111 \u2192 MSB : 0 \u2192 Stop here.<br \/><br \/><\/li><\/ul><p><strong>La m\u00e9thode facile : Utiliser le Nibble gauche<\/strong><\/p><ol><li>Regardez le nibble de gauche (le premier chiffre hexad\u00e9cimal de l'octet).<\/li><li>Si l'octet de gauche est \u00e9gal ou sup\u00e9rieur \u00e0 8 (8, 9, A, B, C, D, E ou F), l'octet suivant fait partie de la variable.<\/li><li>Si le chiffre de gauche est \u00e9gal ou inf\u00e9rieur \u00e0 7 (0 \u00e0 7), vous avez atteint la fin de la variable.<br \/><br \/><\/li><\/ol><p><strong>Pourquoi cela fonctionne-t-il ?<\/strong> Un nibble gauche de 8 ou plus signifie que le MSB est 1, tandis qu'un nibble gauche de 7 ou moins signifie que le MSB est 0.<\/p><p><strong>Exemple :<\/strong><\/p><ul><li>Octet : <code>0xC2<\/code> \u2192 Grignotage \u00e0 gauche : C (sup\u00e9rieur \u00e0 8) \u2192 Continuer.<\/li><li>Octet : <code>0x7F<\/code> \u2192 Grignotage \u00e0 gauche : 7 (moins de 8) \u2192 Arr\u00eat ici.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e1dd116 e-flex e-con-boxed e-con e-parent\" data-id=\"e1dd116\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2820676 elementor-widget elementor-widget-image\" data-id=\"2820676\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"670\" height=\"387\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03.png\" class=\"attachment-large size-large wp-image-2940\" alt=\"SQLite VarInt in hex view 03 \u2014 forensic analysis of variable-length integer encoding\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03.png.webp 670w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03-300x173.png.webp 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03-600x347.png.webp 600w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">La valeur varint (soulign\u00e9e en rouge) identifie la longueur de la table des messages.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-32888b9 elementor-widget elementor-widget-heading\" data-id=\"32888b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Comprendre les variations de longueur des cellules : un exemple pratique<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c77a5d elementor-widget elementor-widget-text-editor\" data-id=\"6c77a5d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les varints sont utilis\u00e9s dans SQLite pour identifier la taille des fichiers <strong>cellules<\/strong> sur les pages de la base de donn\u00e9es. Ces cellules peuvent contenir n'importe quoi, des tableaux aux enregistrements de tableaux, et le(s) premier(s) octet(s) d'une cellule nous indique(nt) la taille de la cellule. Cet indicateur de longueur est lui-m\u00eame un varint, dont la longueur peut varier de 1 \u00e0 9 octets.<\/p><h4><strong>Exemple concret : Fichier WAL<\/strong><\/h4><p>Dans cet exemple, la cellule contient le <strong>tableau des messages<\/strong>. Le premier octet de la cellule est <code>0x81<\/code>indiquant un varint de deux octets.<\/p><ul><li><strong>R\u00e9partition :<\/strong><ul><li>Octet 1 : <code>0x81<\/code> \u2192 Binaire : 10000001 \u2192 Bit de marquage : 1 \u2192 Continuer.<\/li><li>Octet 2 : <code>0x07<\/code> \u2192 Binaire : 00000111 \u2192 Bit de marquage : 0 \u2192 Stop.<\/li><\/ul><\/li><\/ul><h4><strong>D\u00e9coder<\/strong><strong>l'utilisation du Varint<\/strong><\/h4><p>Nous devons maintenant d\u00e9coder la valeur varint. Si nous convertissons simplement la valeur <code>0x8107<\/code> \u00e0 un nombre entier, nous calculerions par erreur un nombre massif, 33 031, qui ne correspond manifestement pas \u00e0 la taille r\u00e9elle de la cellule.<\/p><p><strong>Pourquoi ?<\/strong><br \/>Les bits de marquage ne contribuent pas \u00e0 la valeur r\u00e9elle de la variable. Pour d\u00e9coder correctement le varint, nous devons <strong>d\u00e9pouiller les \u00e9l\u00e9ments de marquage<\/strong> et n'interpr\u00e9ter que les parties significatives de la repr\u00e9sentation binaire. Voici comment proc\u00e9der :<\/p><ul><li><strong>D\u00e9coder :<\/strong><ul><li>Retirer les bits de marquage : 0000001 et 0000111.<\/li><li>Combinez les deux septuors : 00000000 10000111 \u2192 D\u00e9cimale : 135.<\/li><\/ul><\/li><li>La longueur de la cellule est de 135 octets (sans compter le varint et le ROWID).<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae9848d elementor-widget elementor-widget-video\" data-id=\"ae9848d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=5Gr4LtE-_iE&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7df1e43 e-flex e-con-boxed e-con e-parent\" data-id=\"7df1e43\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f2f28f2 elementor-cta--layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-bg-transform elementor-bg-transform-zoom-in elementor-widget elementor-widget-call-to-action\" data-id=\"f2f28f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<a class=\"elementor-cta\" href=\"https:\/\/elusivedata.io\/fr\/sqlite-forensics\/?v=efad7abb323e\">\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tNotre formation SQLite Forensics vous permet de d\u00e9coder \u00e9tape par \u00e9tape les varints, les freelists et d'autres structures internes, afin de d\u00e9passer les limites des outils.\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<span class=\"elementor-cta__button elementor-button elementor-size-\">\n\t\t\t\t\t\tEn savoir plus \u2192\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fa75970 elementor-widget elementor-widget-heading\" data-id=\"fa75970\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Utilisation du calculateur Varint pour l'efficacit\u00e9<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-52213a4 elementor-widget elementor-widget-text-editor\" data-id=\"52213a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le <a href=\"https:\/\/elusivedata.io\/fr\/outils-calculatrice-varint\/?v=efad7abb323e\">Calculateur Varint<\/a> simplifie ce processus. Entrez la valeur hexad\u00e9cimale (par exemple, 8107) pour d\u00e9coder rapidement la varint. Dans l'exemple ci-dessus, la calculatrice renvoie 135, ce qui confirme la longueur.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-98af75a e-flex e-con-boxed e-con e-parent\" data-id=\"98af75a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-afaeca0 elementor-widget elementor-widget-image\" data-id=\"afaeca0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"402\" height=\"412\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Calculator_1.png\" class=\"attachment-large size-large wp-image-2951\" alt=\"Calculator for SQLite forensics \u2014 forensic hex value calculation and conversion tool\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Calculator_1.png.webp 402w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Calculator_1-293x300.png.webp 293w\" sizes=\"(max-width: 402px) 100vw, 402px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Conversion de la valeur varint 0x8107 en valeur d\u00e9cimale 135<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f3ada8e e-flex e-con-boxed e-con e-parent\" data-id=\"f3ada8e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8882a6a elementor-widget elementor-widget-heading\" data-id=\"8882a6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">D\u00e9codage des variantes dans les en-t\u00eates d'enregistrement<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-24e5c3b elementor-widget elementor-widget-text-editor\" data-id=\"24e5c3b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Dans SQLite, les en-t\u00eates d'enregistrement utilisent des varints pour d\u00e9finir :<\/p><ol><li><strong>Longueur :<\/strong> Quantit\u00e9 de donn\u00e9es \u00e0 lire.<\/li><li><strong>Type :<\/strong> Comment interpr\u00e9ter les donn\u00e9es (entier, cha\u00eene, BLOB, etc.).<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-93e73f3 e-flex e-con-boxed e-con e-parent\" data-id=\"93e73f3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e42e020 elementor-widget elementor-widget-image\" data-id=\"e42e020\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"670\" height=\"387\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint.png\" class=\"attachment-large size-large wp-image-2955\" alt=\"SQLite record header string length VarInt \u2014 forensic analysis of text field encoding\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint.png.webp 670w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint-300x173.png.webp 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint-600x347.png.webp 600w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">La valeur 0x25 dans l'en-t\u00eate de cet enregistrement indique la longueur de la cha\u00eene dans la charge utile.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2c705b3 e-flex e-con-boxed e-con e-parent\" data-id=\"2c705b3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2407d45 elementor-widget elementor-widget-text-editor\" data-id=\"2407d45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><strong>Exemple : Longueur de la cha\u00eene<\/strong><\/h4>\nD\u00e9codons un varint dans un en-t\u00eate d'enregistrement :\n<ul>\n \t<li><strong>Varint :<\/strong> <code>0x25<\/code>\n<ul>\n \t<li>Nibble gauche : 2 (moins de 8) \u2192 Varint \u00e0 un octet.<\/li>\n \t<li>D\u00e9cimale : 37.<\/li>\n<\/ul>\n<\/li>\n \t<li><strong>Charge utile :<\/strong> Longueur de la cha\u00eene = 12 octets (+97444455667).<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c99b93d e-flex e-con-boxed e-con e-parent\" data-id=\"c99b93d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f8fbf4b elementor-widget elementor-widget-image\" data-id=\"f8fbf4b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"295\" height=\"300\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-295x300.png\" class=\"attachment-medium size-medium wp-image-8526\" alt=\"SQLite VarInt Calculator tool \u2014 decode variable-length integers in forensic analysis\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-295x300.png.webp 295w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-768x781.png.webp 768w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-12x12.png.webp 12w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-600x610.png.webp 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38.png.webp 812w\" sizes=\"(max-width: 295px) 100vw, 295px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">La calculatrice Varint convertit les varints en cha\u00eenes de caract\u00e8res et en BLOB<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7a6e38f e-flex e-con-boxed e-con e-parent\" data-id=\"7a6e38f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ea4454 elementor-widget elementor-widget-heading\" data-id=\"7ea4454\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">R\u00e9flexions finales<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a55de6 elementor-widget elementor-widget-text-editor\" data-id=\"6a55de6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Comprendre et d\u00e9coder les varints est une comp\u00e9tence essentielle pour tout enqu\u00eateur en criminalistique num\u00e9rique travaillant avec des bases de donn\u00e9es SQLite. Ces entiers compacts sont essentiels pour interpr\u00e9ter les structures des bases de donn\u00e9es, d\u00e9terminer la taille des cellules et r\u00e9cup\u00e9rer efficacement les donn\u00e9es.<\/p>\n<p>Avec des outils comme le <a href=\"https:\/\/elusivedata.io\/fr\/outils-calculatrice-varint\/?v=efad7abb323e\">Calculateur Varint,<\/a> le processus devient plus accessible, ce qui permet aux praticiens de la police scientifique de se concentrer sur la d\u00e9couverte de la v\u00e9rit\u00e9 cach\u00e9e dans les preuves num\u00e9riques. La ma\u00eetrise des varints est plus qu'une comp\u00e9tence technique, c'est une capacit\u00e9 vitale qui peut avoir un impact direct sur l'issue des enqu\u00eates.<\/p>\n<p>Vous pouvez en savoir plus et t\u00e9l\u00e9charger le <a href=\"https:\/\/elusivedata.io\/fr\/outils-calculatrice-varint\/?v=efad7abb323e\">Calculateur Varint <\/a>ici :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b4cf2b5 elementor-widget elementor-widget-button\" data-id=\"b4cf2b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/elusivedata.io\/fr\/outils-calculatrice-varint\/?v=efad7abb323e\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">T\u00e9l\u00e9charger la calculatrice VarInt<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b6082e2 elementor-widget elementor-widget-heading\" data-id=\"b6082e2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vous pourriez \u00e9galement \u00eatre int\u00e9ress\u00e9 par<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62b1289 elementor-widget elementor-widget-video\" data-id=\"62b1289\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=QFn63mQ5_gI&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7413dc6 elementor-cta--layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-bg-transform elementor-bg-transform-zoom-in elementor-widget elementor-widget-call-to-action\" data-id=\"7413dc6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<a class=\"elementor-cta\" href=\"https:\/\/elusivedata.io\/fr\/ed-sqlite-visualizer\/?v=efad7abb323e\">\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tSQLite Visualizer. Une toute nouvelle fa\u00e7on d'explorer SQLite.\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__description elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tLe futur ED SQLite Visualizer vous permet de voir les internes de la base de donn\u00e9es, de r\u00e9cup\u00e9rer les enregistrements cach\u00e9s et de relier les points plus rapidement que jamais, le tout visuellement. D\u00e9j\u00e0 utilis\u00e9 dans notre cours complet sur SQLite, il sera bient\u00f4t disponible pour tous. \t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<span class=\"elementor-cta__button elementor-button elementor-size-\">\n\t\t\t\t\t\tVoir ce qui va suivre \u2192\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Les varints sont l'\u00e9pine dorsale du stockage de donn\u00e9es efficace de SQLite, codant les valeurs dans un format compact que les enqu\u00eateurs doivent d\u00e9coder pour d\u00e9couvrir des preuves critiques. Ce blog traite du processus de d\u00e9codage, d'exemples concrets et d'outils tels que la calculatrice Varint pour simplifier l'analyse forensique.<\/p>","protected":false},"author":1,"featured_media":2926,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-2925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile-forensics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Decoding Varints: A Critical Skill in SQLite Forensics - Elusive Data<\/title>\n<meta name=\"description\" content=\"Decoding variable-length integers (Varints) is a critical skill in SQLite forensics. Learn how Varints work, where they appear in mobile app databases, and how to decode them manually.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elusivedata.io\/fr\/le-decodage-des-variantes-une-competence-essentielle-dans-lanalyse-judiciaire-des-donnees-sqlite\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Decoding Varints: A Critical Skill in SQLite Forensics\" \/>\n<meta property=\"og:description\" content=\"Decoding variable-length integers (Varints) is a critical skill in SQLite forensics. 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