{"id":77474,"date":"2026-04-02T09:00:00","date_gmt":"2026-04-02T07:00:00","guid":{"rendered":"https:\/\/www.codeur.com\/blog\/?p=77474"},"modified":"2026-04-02T09:00:03","modified_gmt":"2026-04-02T07:00:03","slug":"one-time-password","status":"publish","type":"post","link":"https:\/\/www.codeur.com\/blog\/one-time-password\/","title":{"rendered":"One Time Password&nbsp;: une s\u00e9curit\u00e9 renforc\u00e9e pour votre entreprise"},"content":{"rendered":"\n<p>Un simple mot de passe suffit aujourd\u2019hui pour compromettre un compte en quelques secondes.<\/p>\n\n\n\n<p>Entre phishing, fuites de donn\u00e9es et attaques automatis\u00e9es, les cybermenaces n\u2019ont jamais \u00e9t\u00e9 aussi nombreuses. Dans ce contexte, comment prot\u00e9ger efficacement vos outils, vos \u00e9quipes et les donn\u00e9es de vos clients&nbsp;?<\/p>\n\n\n\n<p>La r\u00e9ponse tient en trois lettres&nbsp;: <strong>OTP (One Time Password)<\/strong>.<\/p>\n\n\n\n<p>Pour s\u00e9curiser votre entreprise, vous pouvez aussi faire appel \u00e0 un <a href=\"https:\/\/www.codeur.com\/consultant\/securite\" target=\"_blank\" rel=\"noreferrer noopener\">consultant en cybers\u00e9curit\u00e9<\/a> sur Codeur.com.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu&#8217;est-ce qu&#8217;un One Time Password&nbsp;?<\/h2>\n\n\n\n<p>Vous avez sans doute d\u00e9j\u00e0 utilis\u00e9 un One Time Password (OTP) sans le savoir.<\/p>\n\n\n\n<p>Un <strong>OTP<\/strong> est un mot de passe \u00e0 usage unique, envoy\u00e9 par SMS, email ou g\u00e9n\u00e9r\u00e9 via une application. Contrairement \u00e0 un mot de passe classique, il&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>n\u2019est valable qu\u2019une seule fois<\/li>\n\n\n\n<li>expire rapidement<\/li>\n\n\n\n<li>change automatiquement<\/li>\n<\/ul>\n\n\n\n<p>M\u00eame s\u2019il est intercept\u00e9, il devient inutilisable.<\/p>\n\n\n\n<p>C\u2019est ce qui en fait une solution id\u00e9ale pour renforcer la s\u00e9curit\u00e9 des connexions, notamment dans le cadre de la <strong>double authentification <\/strong>(2FA).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pourquoi les mots de passe seuls ne suffisent plus&nbsp;?<\/strong><\/h2>\n\n\n\n<p>Les mots de passe traditionnels pr\u00e9sentent plusieurs failles&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>souvent trop simples<\/li>\n\n\n\n<li>r\u00e9utilis\u00e9s sur plusieurs sites<\/li>\n\n\n\n<li>vuln\u00e9rables au phishing<\/li>\n<\/ul>\n\n\n\n<p>Les OTP viennent ajouter une <strong>seconde couche de s\u00e9curit\u00e9<\/strong> indispensable. M\u00eame si un pirate obtient un mot de passe, il ne pourra pas acc\u00e9der au compte sans le code temporaire.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment fonctionne un One Time Password&nbsp;?<\/h2>\n\n\n\n<p>Les OTP reposent sur des algorithmes cryptographiques s\u00e9curis\u00e9s qui permettent de g\u00e9n\u00e9rer des codes <strong>uniques, temporaires et impossibles \u00e0 pr\u00e9dire<\/strong>.<\/p>\n\n\n\n<p>Deux standards principaux sont utilis\u00e9s aujourd\u2019hui&nbsp;:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>TOTP (Time-based One-Time Password)<\/strong><\/h3>\n\n\n\n<p>Le <strong>TOTP<\/strong> est la m\u00e9thode la plus r\u00e9pandue.<\/p>\n\n\n\n<p>Le code est g\u00e9n\u00e9r\u00e9 \u00e0 partir de&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>l\u2019heure actuelle<\/li>\n\n\n\n<li>une cl\u00e9 secr\u00e8te partag\u00e9e entre le serveur et l\u2019utilisateur<\/li>\n<\/ul>\n\n\n\n<p>Ces deux \u00e9l\u00e9ments sont combin\u00e9s via un algorithme pour produire un code unique.<\/p>\n\n\n\n<p>Ce code&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>est valable g\u00e9n\u00e9ralement <strong>30 \u00e0 60 secondes<\/strong><\/li>\n\n\n\n<li>est automatiquement renouvel\u00e9<\/li>\n\n\n\n<li>ne peut pas \u00eatre r\u00e9utilis\u00e9<\/li>\n<\/ul>\n\n\n\n<p>Concr\u00e8tement&nbsp;: m\u00eame si un pirate intercepte un code, il devient inutilisable quelques secondes plus tard.<\/p>\n\n\n\n<p>C\u2019est la technologie utilis\u00e9e par des applications comme Google Authenticator ou Authy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>HOTP (HMAC-based One-Time Password)<\/strong><\/h3>\n\n\n\n<p>Le <strong>HOTP<\/strong> fonctionne diff\u00e9remment&nbsp;: il ne d\u00e9pend pas du temps, mais d\u2019un <strong>compteur d\u2019utilisation<\/strong>.<\/p>\n\n\n\n<p>Le code est g\u00e9n\u00e9r\u00e9 \u00e0 partir&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>d&#8217;une cl\u00e9 secr\u00e8te<\/li>\n\n\n\n<li>d&#8217;un compteur qui s\u2019incr\u00e9mente \u00e0 chaque utilisation<\/li>\n<\/ul>\n\n\n\n<p>\u00c0 chaque nouvelle demande, un code totalement diff\u00e9rent est produit.<\/p>\n\n\n\n<p>Contrairement au TOTP&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le code <strong>n\u2019expire pas dans le temps<\/strong><\/li>\n\n\n\n<li>il reste valide tant qu\u2019il n\u2019a pas \u00e9t\u00e9 utilis\u00e9<\/li>\n<\/ul>\n\n\n\n<p>Ce syst\u00e8me est souvent utilis\u00e9 dans&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>des dispositifs physiques (cl\u00e9s de s\u00e9curit\u00e9, tokens)<\/li>\n\n\n\n<li>certains environnements professionnels n\u00e9cessitant une synchronisation pr\u00e9cise<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">A qui sont destin\u00e9s les OTP&nbsp;?<\/h2>\n\n\n\n<p>Les OTP sont autant destin\u00e9s au parc informatique interne d\u2019une entreprise, qu\u2019aux clients.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u2019utilisation des OTP en interne<\/h3>\n\n\n\n<p>Les One Time Passwords (OTP) transforment la mani\u00e8re dont les entreprises s\u00e9curisent leur environnement interne. Faciles \u00e0 utiliser, ils offrent aux employ\u00e9s une m\u00e9thode de connexion s\u00fbre, les lib\u00e9rant du fardeau de retenir de multiples mots de passe.<\/p>\n\n\n\n<p>Cette simplicit\u00e9 se traduit par une productivit\u00e9 accrue et une protection renforc\u00e9e des donn\u00e9es sensibles, qui vont des informations sur les employ\u00e9s aux transactions commerciales en passant par les brevets et documents marketing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u2019utilisation des OTP c\u00f4t\u00e9 clients<\/h3>\n\n\n\n<p>C\u00f4t\u00e9 clients, les OTP sont la cl\u00e9 d&#8217;une exp\u00e9rience en ligne plus s\u00fbre et fluide. Utilis\u00e9s par les e-commerces et services en ligne, ils garantissent la s\u00e9curit\u00e9 des donn\u00e9es clients tout en simplifiant les processus de v\u00e9rification.<\/p>\n\n\n\n<p>R\u00e9sultat&nbsp;: une exp\u00e9rience utilisateur am\u00e9lior\u00e9e et une confiance renforc\u00e9e.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-1024x683.jpeg\" alt=\"exemple one time password\" class=\"wp-image-77476\" srcset=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-1024x683.jpeg 1024w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-300x200.jpeg 300w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-768x512.jpeg 768w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-60x40.jpeg 60w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-370x247.jpeg 370w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-270x180.jpeg 270w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-570x380.jpeg 570w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients-740x493.jpeg 740w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/one-time-password-clients.jpeg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi les entreprises doivent adopter le One Time Password&nbsp;?<\/h2>\n\n\n\n<p>Les OTP offrent plusieurs avantages significatifs&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>S\u00e9curit\u00e9 renforc\u00e9e<\/strong>&nbsp;: Ils r\u00e9duisent consid\u00e9rablement le risque de piratage de comptes, que ce soit en interne ou ceux de vos clients.<\/li>\n\n\n\n<li><strong>Facilit\u00e9 d&#8217;int\u00e9gration<\/strong>&nbsp;: Ils peuvent \u00eatre facilement int\u00e9gr\u00e9s dans les syst\u00e8mes existants. Un <a href=\"https:\/\/www.codeur.com\/prestataire\/securite\" target=\"_blank\" rel=\"noreferrer noopener\">prestataire en cybers\u00e9curit\u00e9<\/a> pourra vous accompagner durant cette proc\u00e9dure.<\/li>\n\n\n\n<li><strong>Confiance accrue des clients<\/strong>&nbsp;: Utiliser des OTP montre que votre entreprise prend au s\u00e9rieux la protection des donn\u00e9es. Cela incite les clients \u00e0 vous choisir comme partenaire de confiance.<\/li>\n\n\n\n<li><strong>Connexion plus fluide<\/strong>&nbsp;: les abandons d&#8217;achat dus \u00e0 l&#8217;oubli de mots de passe sont ainsi minimis\u00e9s.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comment choisir un g\u00e9n\u00e9rateur OTP&nbsp;?<\/h2>\n\n\n\n<p>Lors de la s\u00e9lection d&#8217;un fournisseur OTP pour votre entreprise, consid\u00e9rez ces facteurs cl\u00e9s&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>S\u00e9curit\u00e9 de bout en bout<\/strong>&nbsp;: Optez pour un fournisseur fiable offrant un chiffrement robuste et des options d&#8217;automatisation pour la double authentification (2FA).<\/li>\n\n\n\n<li><strong>Facilit\u00e9 d&#8217;installation<\/strong>&nbsp;: Choisissez un fournisseur dont l&#8217;API s&#8217;int\u00e8gre ais\u00e9ment \u00e0 vos syst\u00e8mes existants, avec une documentation claire.<\/li>\n\n\n\n<li><strong>Rentabilit\u00e9<\/strong>&nbsp;: Recherchez des options \u00e9conomiques avec des plans personnalis\u00e9s ou des remises sur volume, tout en v\u00e9rifiant l&#8217;absence de frais cach\u00e9s.<\/li>\n\n\n\n<li><strong>Service client\u00e8le<\/strong>&nbsp;: Privil\u00e9giez les fournisseurs offrant un support client 24\/7 via email, chat et t\u00e9l\u00e9phone.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3 g\u00e9n\u00e9rateurs OTP \u00e0 conna\u00eetre<\/h2>\n\n\n\n<p>Si vous souhaitez utiliser un One Time Password pour s\u00e9curiser vos outils informatiques, voici 3 solutions OTP performantes&nbsp;:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Google Authenticator&nbsp;: la solution OTP la plus simple<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"608\" height=\"637\" src=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator.png\" alt=\"one time password google authenticator\" class=\"wp-image-77478\" srcset=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator.png 608w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator-286x300.png 286w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator-57x60.png 57w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator-370x388.png 370w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator-270x283.png 270w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator-285x300.png 285w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-google_authenticator-570x597.png 570w\" sizes=\"(max-width: 608px) 100vw, 608px\" \/><\/figure>\n\n\n\n<p>Outil gratuit et intuitif, <a href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.google.android.apps.authenticator2\" target=\"_blank\" rel=\"noreferrer noopener\">Google Authenticator<\/a> propose une authentification multi-facteurs robuste sur Android, iOS et bien d&#8217;autres plateformes. Il g\u00e9n\u00e8re des OTP de six \u00e0 huit chiffres qui se renouvellent toutes les 30 secondes.<\/p>\n\n\n\n<p>Simple d&#8217;utilisation, il requiert n\u00e9anmoins une configuration individuelle pour chaque site et reste vuln\u00e9rable aux attaques si le smartphone est compromis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">OneLogin Protect&nbsp;: un logiciel d&#8217;authentification OTP<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"421\" src=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-1024x421.png\" alt=\"solution otp one login protect\" class=\"wp-image-77477\" srcset=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-1024x421.png 1024w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-300x123.png 300w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-768x316.png 768w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-60x25.png 60w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-370x152.png 370w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-270x111.png 270w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-570x234.png 570w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login-740x304.png 740w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-one-login.png 1297w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Utilisant un l&#8217;algorithme TOTP, <a href=\"https:\/\/www.onelogin.com\/product\/one-time-password\" target=\"_blank\" rel=\"noreferrer noopener\">OneLogin Protect<\/a> permet de mettre en oeuvre une authentification multi-facteurs. Cette application mobile g\u00e9n\u00e8re des mots de passe valides durant 30 secondes.<\/p>\n\n\n\n<p>Facile \u00e0 installer et \u00e0 configurer, elle n\u00e9cessite cependant une connexion Internet et peut \u00eatre moins pratique si le smartphone est perdu ou vol\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Authy&nbsp;: un one time password id\u00e9al pour l&#8217;authentification \u00e0 2 facteurs<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"455\" src=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-1024x455.png\" alt=\"solution OTP authy 2FA\" class=\"wp-image-77479\" srcset=\"https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-1024x455.png 1024w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-300x133.png 300w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-768x342.png 768w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-1536x683.png 1536w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-60x27.png 60w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-370x165.png 370w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-270x120.png 270w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-570x254.png 570w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy-740x329.png 740w, https:\/\/www.codeur.com\/blog\/wp-content\/uploads\/2023\/11\/generateur-OTP-authy.png 1875w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.authy.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Authy<\/a> est une solution gratuite d&#8217;authentification \u00e0 deux facteurs, facile \u00e0 configurer et dot\u00e9e de fonctionnalit\u00e9s comme Touch ID ou les sauvegardes chiffr\u00e9es. La plateforme pr\u00e9vient le blocage des comptes en cas de perte du t\u00e9l\u00e9phone et synchronise l&#8217;authentification sur divers appareils de mani\u00e8re intuitive.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Notre astuce pour utiliser l\u2019One Time Password dans votre entreprise<\/h2>\n\n\n\n<p>L&#8217;adoption des One Time Passwords dans votre entreprise est une \u00e9tape strat\u00e9gique vers une s\u00e9curit\u00e9 renforc\u00e9e.<\/p>\n\n\n\n<p>Une astuce cl\u00e9 pour utiliser de mani\u00e8re optimale les OTP est de sensibiliser et former votre personnel&nbsp;! Chaque employ\u00e9 doit conna\u00eetre l\u2019importance et le fonctionnement de ce syst\u00e8me pour l\u2019utiliser au quotidien, et guider vos clients durant leur \u00e9tape de connexion.<\/p>\n\n\n\n<p>Pour la mise en \u0153uvre d\u2019une strat\u00e9gie de cybers\u00e9curit\u00e9 sur mesure, faites appel \u00e0 un <a href=\"https:\/\/www.codeur.com\/#open-fast\" target=\"_blank\" rel=\"noreferrer noopener\">freelance<\/a> expert en cybers\u00e9curit\u00e9 sur Codeur.com&nbsp;!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un simple mot de passe suffit aujourd\u2019hui pour compromettre un compte en quelques secondes. Entre phishing, fuites de donn\u00e9es et attaques automatis\u00e9es, les cybermenaces n\u2019ont jamais \u00e9t\u00e9 aussi nombreuses. Dans ce contexte, comment prot\u00e9ger efficacement vos outils, vos \u00e9quipes et les donn\u00e9es de vos clients&nbsp;? La r\u00e9ponse tient en trois lettres&nbsp;: OTP (One Time Password). [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":109651,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[16],"tags":[39],"class_list":["post-77474","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-securite","tag-conseils"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment mettre en place un One Time Password (OTP) ?<\/title>\n<meta name=\"description\" content=\"Un One Time Password permet d&#039;obtenir un identifiant s\u00e9curis\u00e9 pour vous authentifier sur un site ou une application. D\u00e9couvrez 3 solutions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.codeur.com\/blog\/one-time-password\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment mettre en place un One Time Password (OTP) ?\" \/>\n<meta property=\"og:description\" content=\"Un One Time Password permet d&#039;obtenir un identifiant s\u00e9curis\u00e9 pour vous authentifier sur un site ou une application. 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