{"id":74,"date":"2026-05-01T19:35:11","date_gmt":"2026-05-01T17:35:11","guid":{"rendered":"https:\/\/eryann.fr\/?p=74"},"modified":"2026-05-01T19:36:06","modified_gmt":"2026-05-01T17:36:06","slug":"fiche-certificats-ssl-et-fonctionnement-avec-un-site-web","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/systeme\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\/","title":{"rendered":"Fiche certificats SSL et fonctionnement avec un site web"},"content":{"rendered":"\n<p>Dans un contexte BTS CIEL ou SIO, les certificats SSL\/TLS sont essentiels pour s\u00e9curiser les \u00e9changes entre un navigateur et un serveur web.<br>Ils garantissent la confidentialit\u00e9, l\u2019int\u00e9grit\u00e9 et l\u2019authenticit\u00e9 des communications.<\/p>\n\n\n\n<p>L\u2019objectif est de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>comprendre ce qu\u2019est un certificat SSL<\/li>\n\n\n\n<li>comprendre le r\u00f4le du chiffrement<\/li>\n\n\n\n<li>expliquer le fonctionnement avec un site web<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"1024\" src=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-10-683x1024.png\" alt=\"\" class=\"wp-image-75\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-10-683x1024.png 683w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-10-200x300.png 200w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-10-768x1152.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-10.png 1024w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Notions essentielles<\/h2>\n\n\n\n<p>Certificat SSL<br>Fichier num\u00e9rique qui permet d\u2019identifier un serveur et de chiffrer les communications.<\/p>\n\n\n\n<p>Il contient :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le nom de domaine (ex : monsite.fr)<\/li>\n\n\n\n<li>la cl\u00e9 publique<\/li>\n\n\n\n<li>l\u2019autorit\u00e9 de certification (CA)<\/li>\n\n\n\n<li>une signature num\u00e9rique<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Cl\u00e9 publique \/ cl\u00e9 priv\u00e9e<br>Le chiffrement repose sur une paire de cl\u00e9s :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cl\u00e9 publique \u2192 utilis\u00e9e pour chiffrer<\/li>\n\n\n\n<li>cl\u00e9 priv\u00e9e \u2192 utilis\u00e9e pour d\u00e9chiffrer<\/li>\n<\/ul>\n\n\n\n<p>La cl\u00e9 priv\u00e9e reste sur le serveur et ne doit jamais \u00eatre partag\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Autorit\u00e9 de certification (CA)<br>Organisme de confiance qui signe les certificats.<\/p>\n\n\n\n<p>Exemples :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Let\u2019s Encrypt<\/li>\n\n\n\n<li>DigiCert<\/li>\n\n\n\n<li>GlobalSign<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Fonctionnement avec un site web<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Connexion HTTPS<\/h3>\n\n\n\n<p>L\u2019utilisateur acc\u00e8de \u00e0 :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>https:&#47;&#47;monsite.fr<\/code><\/pre>\n\n\n\n<p>Le navigateur demande une connexion s\u00e9curis\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Envoi du certificat<\/h3>\n\n\n\n<p>Le serveur envoie son certificat SSL au navigateur.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. V\u00e9rification<\/h3>\n\n\n\n<p>Le navigateur v\u00e9rifie :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>que le certificat est valide<\/li>\n\n\n\n<li>qu\u2019il correspond au domaine<\/li>\n\n\n\n<li>qu\u2019il est sign\u00e9 par une autorit\u00e9 reconnue<\/li>\n<\/ul>\n\n\n\n<p>Si tout est correct :<br>\u2192 connexion autoris\u00e9e<\/p>\n\n\n\n<p>Sinon :<br>\u2192 alerte de s\u00e9curit\u00e9<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u00c9change de cl\u00e9<\/h3>\n\n\n\n<p>Le navigateur g\u00e9n\u00e8re une cl\u00e9 de session (sym\u00e9trique).<br>Cette cl\u00e9 est chiffr\u00e9e avec la cl\u00e9 publique du serveur.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. D\u00e9chiffrement<\/h3>\n\n\n\n<p>Le serveur d\u00e9chiffre la cl\u00e9 de session avec sa cl\u00e9 priv\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">6. Communication s\u00e9curis\u00e9e<\/h3>\n\n\n\n<p>Les \u00e9changes suivants sont chiffr\u00e9s avec la cl\u00e9 de session.<\/p>\n\n\n\n<p>\u2192 plus rapide que le chiffrement asym\u00e9trique<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9sum\u00e9 du fonctionnement<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le certificat identifie le serveur<\/li>\n\n\n\n<li>le chiffrement asym\u00e9trique sert \u00e0 s\u00e9curiser l\u2019\u00e9change<\/li>\n\n\n\n<li>le chiffrement sym\u00e9trique sert pour les donn\u00e9es<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Types de certificats<\/h2>\n\n\n\n<p>Certificat autosign\u00e9<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cr\u00e9\u00e9 localement<\/li>\n\n\n\n<li>non reconnu par les navigateurs<\/li>\n\n\n\n<li>usage interne<\/li>\n<\/ul>\n\n\n\n<p>Certificat Let\u2019s Encrypt<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>gratuit<\/li>\n\n\n\n<li>reconnu<\/li>\n\n\n\n<li>renouvellement automatique<\/li>\n<\/ul>\n\n\n\n<p>Certificat commercial<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>payant<\/li>\n\n\n\n<li>garanties suppl\u00e9mentaires<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00f4le du HTTPS<\/h2>\n\n\n\n<p>Confidentialit\u00e9<br>Emp\u00eache l\u2019interception des donn\u00e9es<\/p>\n\n\n\n<p>Int\u00e9grit\u00e9<br>Emp\u00eache la modification des donn\u00e9es<\/p>\n\n\n\n<p>Authentification<br>Garantit l\u2019identit\u00e9 du serveur<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rification c\u00f4t\u00e9 utilisateur<\/h2>\n\n\n\n<p>Dans le navigateur :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cadenas affich\u00e9<\/li>\n\n\n\n<li>certificat consultable<\/li>\n\n\n\n<li>informations sur l\u2019\u00e9metteur<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Points cl\u00e9s<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HTTPS est indispensable en production<\/li>\n\n\n\n<li>le certificat identifie le serveur<\/li>\n\n\n\n<li>la cl\u00e9 priv\u00e9e doit rester secr\u00e8te<\/li>\n\n\n\n<li>Let\u2019s Encrypt est la solution standard<\/li>\n\n\n\n<li>le chiffrement est hybride (asym\u00e9trique + sym\u00e9trique)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Suite logique<\/h2>\n\n\n\n<p>Pour aller plus loin :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>configuration HTTPS Apache<\/li>\n\n\n\n<li>renouvellement automatique Let\u2019s Encrypt<\/li>\n\n\n\n<li>durcissement TLS (protocoles, ciphers)<\/li>\n\n\n\n<li>HSTS et s\u00e9curit\u00e9 avanc\u00e9e<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans un contexte BTS CIEL ou SIO, les certificats SSL\/TLS sont essentiels pour s\u00e9curiser les \u00e9changes entre un navigateur et un serveur web.Ils garantissent la confidentialit\u00e9, l\u2019int\u00e9grit\u00e9 et l\u2019authenticit\u00e9 des communications. L\u2019objectif est de : Notions essentielles Certificat SSLFichier num\u00e9rique qui permet d\u2019identifier un serveur et de chiffrer les communications. Il contient : Cl\u00e9 publique [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-systeme"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fiche certificats SSL et fonctionnement avec un site web - Eryann Breizh SecOps<\/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:\/\/eryann.fr\/index.php\/systeme\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche certificats SSL et fonctionnement avec un site web - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Dans un contexte BTS CIEL ou SIO, les certificats SSL\/TLS sont essentiels pour s\u00e9curiser les \u00e9changes entre un navigateur et un serveur web.Ils garantissent la confidentialit\u00e9, l\u2019int\u00e9grit\u00e9 et l\u2019authenticit\u00e9 des communications. L\u2019objectif est de : Notions essentielles Certificat SSLFichier num\u00e9rique qui permet d\u2019identifier un serveur et de chiffrer les communications. Il contient : Cl\u00e9 publique [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/eryann.fr\/index.php\/systeme\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\/\" \/>\n<meta property=\"og:site_name\" content=\"Eryann Breizh SecOps\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-01T17:35:11+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-01T17:36:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-10.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"1536\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"wpadmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"wpadmin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/\"},\"author\":{\"name\":\"wpadmin\",\"@id\":\"https:\\\/\\\/eryann.fr\\\/#\\\/schema\\\/person\\\/d2ee98d2385cd045ed4fe1c07ca320b5\"},\"headline\":\"Fiche certificats SSL et fonctionnement avec un site web\",\"datePublished\":\"2026-05-01T17:35:11+00:00\",\"dateModified\":\"2026-05-01T17:36:06+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/\"},\"wordCount\":452,\"publisher\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/eryann.fr\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/image-10-683x1024.png\",\"articleSection\":[\"Syst\u00e8me\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/\",\"url\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/\",\"name\":\"Fiche certificats SSL et fonctionnement avec un site web - Eryann Breizh SecOps\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/eryann.fr\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/image-10-683x1024.png\",\"datePublished\":\"2026-05-01T17:35:11+00:00\",\"dateModified\":\"2026-05-01T17:36:06+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#primaryimage\",\"url\":\"https:\\\/\\\/eryann.fr\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/image-10.png\",\"contentUrl\":\"https:\\\/\\\/eryann.fr\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/image-10.png\",\"width\":1024,\"height\":1536},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/eryann.fr\\\/index.php\\\/systeme\\\/fiche-certificats-ssl-et-fonctionnement-avec-un-site-web\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/eryann.fr\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Fiche certificats SSL et fonctionnement avec un site web\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/eryann.fr\\\/#website\",\"url\":\"https:\\\/\\\/eryann.fr\\\/\",\"name\":\"Eryann Breizh SecOps\",\"description\":\"Fiches techniques &amp; 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