{"id":13954,"date":"2025-02-26T03:00:00","date_gmt":"2025-02-26T08:00:00","guid":{"rendered":"https:\/\/www.cscdbs.com\/blog\/?p=13954"},"modified":"2025-02-25T11:38:15","modified_gmt":"2025-02-25T16:38:15","slug":"le-role-de-dkim-spf-et-dmarc-dans-la-securite-des-messageries-d%ca%bcentreprise","status":"publish","type":"post","link":"https:\/\/www.cscdbs.com\/blog\/le-role-de-dkim-spf-et-dmarc-dans-la-securite-des-messageries-d%ca%bcentreprise\/","title":{"rendered":"Le r\u00f4le de DKIM, SPF et DMARC dans la s\u00e9curit\u00e9 des messageries d\u02bcentreprise"},"content":{"rendered":"\n<p>La messagerie \u00e9lectronique est l\u02bcun des outils de communication les plus utilis\u00e9s par les entreprises, mais c\u02bcest aussi une cible privil\u00e9gi\u00e9e des cybercriminels. Les tentatives d\u02bchame\u00e7onnage, de spoofing et d\u02bcusurpation d\u02bcidentit\u00e9 se multiplient et menacent les donn\u00e9es sensibles, l\u02bcimage de marque et la confiance des clients. Pour faire face \u00e0 ces risques, les entreprises se tournent vers plusieurs approches fondamentales en mati\u00e8re de s\u00e9curit\u00e9 de la messagerie \u00e9lectronique&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le cadre SPF (Sender Policy Framework)&nbsp;;<\/li>\n\n\n\n<li>La norme DKIM (DomainKeys Identified Mail)&nbsp;; et<\/li>\n\n\n\n<li>Le protocole DMARC.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Que sont SPF, DKIM et DMARC\u00a0?<\/strong><\/h2>\n\n\n\n<p>Le <strong>SPF<\/strong> est un cadre de validation des e-mails qui permet de v\u00e9rifier si un e-mail provient d\u02bcun serveur de messagerie autoris\u00e9. Les entreprises publient une liste de serveurs d\u02bcenvoi approuv\u00e9s dans leurs enregistrements DNS. \u00c0 la r\u00e9ception d\u02bcun e-mail, le serveur du destinataire v\u00e9rifie l\u02bcadresse IP de l\u02bcexp\u00e9diteur par rapport \u00e0 l\u02bcenregistrement SPF. S\u02bcil y a conformit\u00e9, l\u02bce-mail est alors consid\u00e9r\u00e9 comme l\u00e9gitime.<\/p>\n\n\n\n<p>Le <strong>DKIM<\/strong> garantit qu\u02bcun e-mail n\u02bca pas \u00e9t\u00e9 falsifi\u00e9 pendant le transit. Il utilise une signature cryptographique pour v\u00e9rifier l\u02bcint\u00e9grit\u00e9 de l\u02bce-mail. Le serveur de messagerie de l\u02bcexp\u00e9diteur ajoute une \u00ab&nbsp;signature&nbsp;\u00bb num\u00e9rique aux e-mails sortants, puis le serveur du destinataire utilise la cl\u00e9 publique (stock\u00e9e dans l\u02bcenregistrement DNS de l\u02bcexp\u00e9diteur) pour certifier la signature et valider l\u02bcint\u00e9grit\u00e9 du message.<\/p>\n\n\n\n<p>Le <strong>DMARC<\/strong> se base sur SPF et DKIM en ajoutant une couche de mesures politiques de protection. Il permet aux propri\u00e9taires de noms de domaine d\u02bcindiquer comment les serveurs de messagerie doivent traiter les messages qui \u00e9chouent aux v\u00e9rifications SPF ou DKIM, par exemple en les rejetant, en les marquant comme suspects ou en les autorisant. Le DMARC permet \u00e9galement d\u02bc\u00e9tablir des rapports, assurant ainsi aux propri\u00e9taires de noms de domaine une visibilit\u00e9 sur les activit\u00e9s d\u02bcauthentification des e-mails.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Comment SPF, DKIM et DMARC fonctionnent-ils\u00a0?<\/strong><\/h2>\n\n\n\n<p>Le SPF et Le DKIM sont des protocoles fondamentaux assurant la validation de la source et de l\u02bcint\u00e9grit\u00e9 d\u02bcun e-mail. Dans un flux SPF, l\u02bcexp\u00e9diteur d\u00e9finit une liste de serveurs de messagerie approuv\u00e9s dans l\u02bcenregistrement DNS. Le serveur de r\u00e9ception v\u00e9rifie si l\u02bcadresse IP de l\u02bcexp\u00e9diteur correspond \u00e0 la liste des adresses de confiance. Avec le DKIM, les e-mails sortants sont sign\u00e9s \u00e0 l\u02bcaide d\u02bcune cl\u00e9 priv\u00e9e. Le serveur de r\u00e9ception utilise la cl\u00e9 publique (stock\u00e9e dans l\u02bcenregistrement DNS de l\u02bcexp\u00e9diteur) pour valider l\u02bcint\u00e9grit\u00e9 du message.<\/p>\n\n\n\n<p>DMARC associe ces deux protocoles, garantissant une authentification coh\u00e9rente et permettant aux propri\u00e9taires de noms de domaine de faire appliquer des politiques relatives aux e-mails non approuv\u00e9s. Dans une configuration DMARC, l\u02bcexp\u00e9diteur publie une politique dans son enregistrement DNS (par exemple, rejeter ou mettre en quarantaine les e-mails qui \u00e9chouent au contr\u00f4le SPF ou DKIM). Le serveur de r\u00e9ception applique cette politique et g\u00e9n\u00e8re des rapports permettant d\u02bcaffiner les strat\u00e9gies de s\u00e9curit\u00e9.<\/p>\n\n\n\n<p>Ces dispositifs fonctionnent \u00e0 l\u02bcunisson pour cr\u00e9er une structure \u00e0 plusieurs niveaux destin\u00e9e \u00e0 pr\u00e9server vos e-mails des diverses menaces.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Quels sont les risques en ligne minimis\u00e9s par ces dispositifs\u00a0?<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>L\u02bchame\u00e7onnage et l\u02bcusurpation d\u02bcidentit\u00e9<\/strong>&nbsp;: en v\u00e9rifiant la validit\u00e9 des exp\u00e9diteurs d\u02bce-mails, ces protocoles permettent d\u02bcemp\u00eacher l\u02bcutilisation non autoris\u00e9e de votre nom de domaine en vue de duper les destinataires.<\/li>\n\n\n\n<li><strong>Falsification des e-mails<\/strong>&nbsp;: DKIM pr\u00e9vient l\u02bcalt\u00e9ration des messages pendant leur transit, prot\u00e9geant ainsi les informations sensibles.<\/li>\n\n\n\n<li><strong>Usurpation de marque<\/strong>&nbsp;: DMARC r\u00e9duit le risque que des e-mails frauduleux ternissent la r\u00e9putation et la cr\u00e9dibilit\u00e9 de votre entreprise.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tendances d\u02bcutilisation de DMARC, SPF et DKIM<\/strong><\/h2>\n\n\n\n<p>Dans notre <a href=\"https:\/\/www.cscdbs.com\/fr\/ressources-actualites\/rapport-securite-des-noms-de-domaine\/\">Rapport 2024 sur la s\u00e9curit\u00e9 des noms de domaine<\/a>, nous avons analys\u00e9 les pratiques des entreprises du classement Forbes Global 2000 en mati\u00e8re de s\u00e9curit\u00e9 des noms de domaine, en d\u00e9terminant si des mesures de protection essentielles avaient \u00e9t\u00e9 mises en \u0153uvre. \u00c0 titre d\u02bcexemple, certaines de ces mesures comprenaient <a href=\"https:\/\/www.cscdbs.com\/blog\/comprendre-la-redondance-dns-pourquoi-elle-est-essentielle-pour-la-cybersecurite-et-la-protection-de-la-marque-en-ligne\/\">la redondance du DNS<\/a> et <a href=\"https:\/\/www.cscdbs.com\/blog\/apercu-du-protocole-dnssec\/\">les extensions de s\u00e9curit\u00e9 des noms de domaine (DNSSEC)<\/a>.<\/p>\n\n\n\n<p>Points essentiels du rapport&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DMARC<\/strong>&nbsp;: l\u02bcadoption de ce protocole a fait un bond en avant, 70,6&nbsp;% des entreprises du Global 2000 l\u02bcayant int\u00e9gr\u00e9. Ce chiffre marque une forte augmentation par rapport aux 38,9&nbsp;% enregistr\u00e9s en&nbsp;2020, en faisant ainsi le dispositif le plus largement adopt\u00e9 mentionn\u00e9 dans ce rapport.<\/li>\n\n\n\n<li><strong>SPF<\/strong>&nbsp;: 90,2&nbsp;% des entreprises ont recours au SPF pour authentifier les noms de domaine des e-mails.<\/li>\n\n\n\n<li><strong>DKIM<\/strong>&nbsp;: Malgr\u00e9 son importance, le DKIM reste insuffisamment utilis\u00e9, puisque seulement 12% des entreprises l\u02bcemploient pour prot\u00e9ger leurs communications par e-mail.<\/li>\n<\/ul>\n\n\n\n<p>Les donn\u00e9es r\u00e9v\u00e8lent une sensibilisation accrue \u00e0 certaines m\u00e9thodes de s\u00e9curisation des e-mails, mais aussi des vuln\u00e9rabilit\u00e9s persistantes. Pr\u00e8s de 30&nbsp;% des grandes entreprises ne disposent toujours pas du protocole DMARC, et l\u02bcadoption du protocole DKIM accuse encore un retard consid\u00e9rable, ce qui rend de nombreuses organisations vuln\u00e9rables \u00e0 des menaces telles que l\u02bchame\u00e7onnage, l\u02bcusurpation d\u02bcidentit\u00e9 et la falsification.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Renforcer la s\u00e9curit\u00e9 de votre nom de domaine<\/strong><\/h2>\n\n\n\n<p>Une infrastructure de messagerie non s\u00e9curis\u00e9e expose votre organisation \u00e0 des intrusions co\u00fbteuses, \u00e0 une atteinte \u00e0 sa r\u00e9putation et \u00e0 une perte de confiance de la part de ses clients. Toutefois, la s\u00e9curit\u00e9 des noms de domaine va au-del\u00e0 de la v\u00e9rification des e-mails, puisqu\u02bcelle englobe un \u00e9cosyst\u00e8me complexe \u00e0 plusieurs niveaux, avec diff\u00e9rents points d\u02bcentr\u00e9e potentiels \u00e0 la disposition des acteurs des menaces. D\u00e9couvrez comment nous avons <a href=\"https:\/\/www.cscdbs.com\/fr\/ressources-actualites\/rapport-securite-des-noms-de-domaine\/\">mesur\u00e9 le niveau des dispositifs de s\u00e9curit\u00e9 des noms de domaine<\/a> des entreprises figurant sur la liste du Forbes Global 2000, et voyez o\u00f9 se situe votre organisation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La messagerie \u00e9lectronique est l\u02bcun des outils de communication les plus utilis\u00e9s par les entreprises, mais c\u02bcest aussi une cible privil\u00e9gi\u00e9e des cybercriminels. Les tentatives d\u02bchame\u00e7onnage, de spoofing et d\u02bcusurpation d\u02bcidentit\u00e9 se multiplient et menacent les donn\u00e9es sensibles, l\u02bcimage de marque et la confiance des clients. Pour faire face \u00e0 ces risques, les entreprises se [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":10442,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[545],"tags":[],"class_list":["post-13954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le r\u00f4le de DKIM, SPF et DMARC dans la s\u00e9curit\u00e9 des messageries d\u02bcentreprise | CSC<\/title>\n<meta name=\"description\" content=\"La messagerie \u00e9lectronique est l\u02bcun des outils de communication les plus utilis\u00e9s par les entreprises, mais c\u02bcest aussi une cible privil\u00e9gi\u00e9e des\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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