{"id":65,"date":"2023-07-12T12:34:27","date_gmt":"2023-07-12T12:34:27","guid":{"rendered":"https:\/\/wp.captcha.eu\/?p=65"},"modified":"2024-03-26T18:31:42","modified_gmt":"2024-03-26T18:31:42","slug":"an-introduction-to-captcha__en","status":"publish","type":"post","link":"https:\/\/new.captcha.eu\/fr\/une-introduction-au-captcha__en\/","title":{"rendered":"Qu\u2019est-ce que le captcha et pourquoi en avons-nous besoin ?"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"e5dee0\" data-has-transparency=\"false\" style=\"--dominant-color: #e5dee0;\" fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1-1024x576.jpg\" alt=\"captcha homme et ordinateur portable\" class=\"wp-image-69 not-transparent\" srcset=\"https:\/\/new.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1-1024x576.jpg 1024w, https:\/\/new.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1-300x169.jpg 300w, https:\/\/new.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1-768x432.jpg 768w, https:\/\/new.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1-1536x864.jpg 1536w, https:\/\/new.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1-18x10.jpg 18w, https:\/\/new.captcha.eu\/wp-content\/uploads\/2023\/07\/Blog-img-no1.jpg 1920w\" \/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\">Dans le monde num\u00e9rique d&#039;aujourd&#039;hui, o\u00f9 les programmes informatiques et les algorithmes sont de plus en plus sophistiqu\u00e9s, il existe un probl\u00e8me qui affecte \u00e0 la fois les propri\u00e9taires de sites Web et les utilisateurs : le spam et les abus. Pour se prot\u00e9ger des messages ind\u00e9sirables, des faux comptes et d\u2019autres types d\u2019abus en ligne, de nombreux sites Web ont introduit des captchas. Mais qu\u2019est-ce qu\u2019un captcha exactement et comment \u00e7a marche ?<\/h5>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Qu&#039;est-ce qu&#039;un captcha ?<\/strong><\/h3>\n\n\n\n<p>Captcha signifie \u00ab\u00a0Test de Turing public enti\u00e8rement automatis\u00e9 pour distinguer les ordinateurs des humains\u00a0\u00bb. Le terme a \u00e9t\u00e9 invent\u00e9 par Luis von Ahn, Manuel Blum et John Langford en 2000 \u00e0 l&#039;Universit\u00e9 Carnegie Mellon. Il s&#039;agit d&#039;une technologie qui vise \u00e0 distinguer les programmes informatiques des vrais utilisateurs humains.<\/p>\n\n\n\n<p>Un captcha consiste g\u00e9n\u00e9ralement en une image ou un enregistrement audio contenant une s\u00e9rie de lettres, de chiffres ou de symboles que l&#039;utilisateur doit ensuite saisir pour prouver qu&#039;il est un utilisateur humain. Les captchas classiques sont g\u00e9n\u00e9ralement con\u00e7us pour \u00eatre facilement lus par les humains mais difficiles \u00e0 d\u00e9chiffrer par des programmes informatiques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pourquoi avons-nous besoin de captchas ?<\/strong><\/h3>\n\n\n\n<p>L\u2019objectif principal des captchas est de pr\u00e9venir les attaques automatis\u00e9es. Les sites Web visit\u00e9s par de nombreuses personnes constituent une cible privil\u00e9gi\u00e9e pour les programmes automatis\u00e9s qui usurpent l&#039;identit\u00e9 d&#039;utilisateurs humains afin de diffuser du spam ou de commettre d&#039;autres types d&#039;abus. En mettant en \u0153uvre des captchas, les op\u00e9rateurs de sites Web peuvent garantir que les utilisateurs qui se connectent, publient des commentaires ou effectuent d&#039;autres actions sont bien des utilisateurs humains et ne sont pas contr\u00f4l\u00e9s par des programmes.<\/p>\n\n\n\n<p>Une autre raison d\u2019utiliser les captchas est qu\u2019ils peuvent contribuer \u00e0 accro\u00eetre la s\u00e9curit\u00e9 des comptes d\u2019utilisateurs. Par exemple, si un utilisateur tente de se connecter \u00e0 un compte qui ne lui appartient pas, un captcha peut \u00eatre utilis\u00e9 pour garantir que l&#039;utilisateur est bien une personne et non un programme automatis\u00e9 tentant de pirater le compte.<\/p>\n\n\n\n<p>L&#039;utilisation de captchas peut \u00e9galement contribuer \u00e0 am\u00e9liorer les performances du site Web en r\u00e9duisant le trafic provenant des programmes automatis\u00e9s. Les sites Web visit\u00e9s par de nombreux programmes automatis\u00e9s peuvent ralentir, voire m\u00eame planter, en raison du nombre \u00e9lev\u00e9 de requ\u00eates. En mettant en \u0153uvre des captchas, un propri\u00e9taire de site Web peut garantir que seuls de vrais utilisateurs humains acc\u00e8dent au site Web, am\u00e9liorant ainsi les performances.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Types de captchas<\/strong><\/h3>\n\n\n\n<p>L\u2019objectif principal des captchas est de pr\u00e9venir les attaques automatis\u00e9es. Les sites Web visit\u00e9s par de nombreuses personnes constituent une cible privil\u00e9gi\u00e9e pour les programmes automatis\u00e9s qui usurpent l&#039;identit\u00e9 d&#039;utilisateurs humains afin de diffuser du spam ou de commettre d&#039;autres types d&#039;abus. En mettant en \u0153uvre des captchas, les op\u00e9rateurs de sites Web peuvent garantir que les utilisateurs qui se connectent, publient des commentaires ou effectuent d&#039;autres actions sont bien des utilisateurs humains et ne sont pas contr\u00f4l\u00e9s par des programmes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Captchas de texte<\/strong><\/h3>\n\n\n\n<p>Les captchas de texte obligent l&#039;utilisateur \u00e0 d\u00e9chiffrer un texte d\u00e9form\u00e9 ou perturb\u00e9 et \u00e0 le saisir dans un champ de saisie. Le texte peut \u00e9galement \u00eatre compliqu\u00e9 par des images d\u2019arri\u00e8re-plan ou des couleurs pour le rendre plus difficile \u00e0 d\u00e9chiffrer par les programmes informatiques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Captures d&#039;images<\/strong><\/h3>\n\n\n\n<p>Les captchas d&#039;image n\u00e9cessitent que l&#039;utilisateur identifie une image ou s\u00e9lectionne un certain nombre d&#039;images contenant certaines caract\u00e9ristiques ou objets. Par exemple, il peut \u00eatre demand\u00e9 \u00e0 l&#039;utilisateur de s\u00e9lectionner toutes les images contenant des voitures ou de s\u00e9lectionner toutes les images contenant des feux de circulation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Captchas audio<\/strong><\/h3>\n\n\n\n<p>Avec les captchas audio, l&#039;utilisateur entend un enregistrement vocal d\u00e9form\u00e9 ou perturb\u00e9 et doit ensuite taper le texte prononc\u00e9 dans l&#039;enregistrement. Il s&#039;agit d&#039;une option accessible aux utilisateurs malvoyants ou aux utilisateurs ayant des difficult\u00e9s \u00e0 lire du texte.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Captchas informatiques<\/strong><\/h3>\n\n\n\n<p>Les captchas de t\u00e2ches de calcul obligent l&#039;utilisateur \u00e0 r\u00e9soudre une t\u00e2che math\u00e9matique, comme l&#039;addition de deux nombres ou la r\u00e9solution d&#039;une \u00e9quation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Captchas de puzzle<\/strong><\/h3>\n\n\n\n<p>Les captchas de puzzle n\u00e9cessitent que l&#039;utilisateur effectue une action sp\u00e9cifique, comme joindre des parties d&#039;une image ou d\u00e9placer des objets vers le bon emplacement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Captchas interactifs<\/strong><\/h3>\n\n\n\n<p>Les captchas interactifs n\u00e9cessitent que l&#039;utilisateur effectue une action sp\u00e9cifique, comme d\u00e9placer un objet vers un emplacement sp\u00e9cifique ou remplir un formulaire.<\/p>\n\n\n\n<p>Il existe \u00e9galement des formes de captcha hybrides qui combinent des \u00e9l\u00e9ments de diff\u00e9rents types de captchas pour accro\u00eetre la s\u00e9curit\u00e9 et am\u00e9liorer la convivialit\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D\u00e9fis li\u00e9s \u00e0 l&#039;utilisation des captchas<\/strong><\/h3>\n\n\n\n<p>Bien que les captchas soient un moyen efficace de pr\u00e9venir le spam et les abus sur les sites Web, certains d\u00e9fis peuvent \u00e9galement survenir lors de l&#039;utilisation des captchas\u00a0:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Accessibilit\u00e9<\/h4>\n\n\n\n<p>Les captchas peuvent \u00eatre difficiles d&#039;acc\u00e8s pour les personnes handicap\u00e9es telles que les d\u00e9ficiences visuelles ou auditives. Les captchas textuels peuvent \u00eatre difficiles \u00e0 lire en raison de limitations visuelles, tandis que les captchas audio sont inaccessibles aux utilisateurs sourds.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Exp\u00e9rience utilisateur<\/h4>\n\n\n\n<p>Certains utilisateurs trouvent les captchas frustrants et chronophages, surtout s&#039;ils sont difficiles \u00e0 r\u00e9soudre ou n\u00e9cessitent plusieurs tentatives pour \u00eatre corrects. Cela peut amener les utilisateurs \u00e0 abandonner leurs activit\u00e9s sur le site Web ou \u00e0 basculer vers un autre site Web.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">S\u00e9curit\u00e9<\/h4>\n\n\n\n<p>Les captchas ne sont pas s\u00e9curis\u00e9s 100% et peuvent \u00eatre vaincus par des programmes informatiques sophistiqu\u00e9s, surtout s&#039;ils ne sont pas r\u00e9guli\u00e8rement mis \u00e0 jour ou modifi\u00e9s. En outre, certains captchas peuvent \u00eatre contourn\u00e9s par les solveurs de captcha humains.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Multilinguisme<\/h4>\n\n\n\n<p>Les captchas peuvent \u00eatre difficiles \u00e0 comprendre pour les utilisateurs qui ne parlent pas ou ne lisent pas une langue utilis\u00e9e sur le site Web. Cela peut entra\u00eener des difficult\u00e9s \u00e0 r\u00e9soudre les captchas et \u00e0 acc\u00e9der \u00e0 certains contenus.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Abus<\/h4>\n\n\n\n<p>Les captchas peuvent \u00e9galement \u00eatre utilis\u00e9s de mani\u00e8re abusive par des personnes souhaitant se livrer \u00e0 des activit\u00e9s ill\u00e9gales, telles que le spam ou le phishing. Ces personnes peuvent utiliser les services de r\u00e9solution de captcha humains pour contourner les captchas et poursuivre leurs activit\u00e9s.<\/p>\n\n\n\n<p>Dans l\u2019ensemble, l\u2019utilisation de captchas n\u00e9cessiterait un examen attentif entre s\u00e9curit\u00e9 et convivialit\u00e9. Avec notre solution captcha, vous pouvez garantir \u00e0 parts \u00e9gales la s\u00e9curit\u00e9 et l\u2019exp\u00e9rience utilisateur. Vous pouvez apprendre comment cela fonctionne ici\u00a0: <a rel=\"noreferrer noopener\" href=\"https:\/\/www.captcha.eu\" data-type=\"URL\" data-id=\"https:\/\/www.captcha.eu\" target=\"_blank\">captcha.eu<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Captcha prot\u00e8ge pr\u00e9ventivement contre les acc\u00e8s non autoris\u00e9s gr\u00e2ce aux derni\u00e8res technologies de s\u00e9curit\u00e9.<\/p>","protected":false},"author":1,"featured_media":69,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","footnotes":""},"categories":[19,11,13,37],"tags":[],"class_list":["post-65","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-blog","category-blog","category-english","category-info"],"acf":{"pretitle":"An introduction to Captcha ","intern_slug":"en"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO 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