{"id":658,"date":"2026-05-06T00:00:00","date_gmt":"2026-05-05T22:00:00","guid":{"rendered":"https:\/\/vsx.is\/?p=658"},"modified":"2026-05-05T22:25:53","modified_gmt":"2026-05-05T20:25:53","slug":"le-chiffrement-post-quantique-arrive-proton-mail-lance-une-protection-contre-les-ordinateurs-quantiques-qui-la-propose-deja","status":"publish","type":"post","link":"https:\/\/vsx.is\/fr\/postkvantove-sifrovani-prichazi-proton-mail-spousti-ochranu-pred-kvantovymi-pocitaci-kdo-ji-uz-nabizi\/","title":{"rendered":"Le chiffrement post-quantique arrive : Proton Mail lance une protection contre les ordinateurs quantiques. Qui propose d\u00e9j\u00e0 cette fonctionnalit\u00e9 ?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Les ordinateurs quantiques sont pour l&#x27;instant les e-mails d&#x27;aujourd&#x27;hui <a href=\"https:\/\/vsx.is\/fr\/kolik-dat-o-vas-sbira-vas-messenger-surfshark-zmeril-desitku-nejpouzivanejsich-aplikaci\/\">chiffrement<\/a> Dans la pratique, ils ne les cassent pas. Le risque r\u00e9side toutefois dans le fait que les pirates peuvent d\u00e9j\u00e0 collecter des donn\u00e9es chiffr\u00e9es aujourd&#x27;hui et tenter de les d\u00e9chiffrer plus tard, lorsque les ordinateurs quantiques seront suffisamment puissants. Cette menace est connue sous le nom de \u201e harvest now, decrypt later \u201c (collecter maintenant, d\u00e9chiffrer plus tard) et c&#x27;est pr\u00e9cis\u00e9ment contre elle que le monde du courrier \u00e9lectronique et de la communication commence \u00e0 mettre en place <strong>la cryptographie post-quantique (PQC)<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette semaine, la Suisse a \u00e9galement ajout\u00e9 la prise en charge du chiffrement post-quantique <a href=\"https:\/\/vsx.is\/fr\/bezpecne-emaily\/\">Proton Mail<\/a>. R\u00e9sumons ce que cela signifie, comment l&#x27;activer \u2014 et qui d&#x27;autre propose d\u00e9j\u00e0 une protection similaire.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ce que change Proton Mail<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/vsx.is\/fr\/proton-ecosystem-audit-2026-co-audit-ukazuje-a-jak-cist-komunitni-analyzy\/\">Proton<\/a> Le courrier utilise depuis longtemps <a href=\"https:\/\/vsx.is\/fr\/e-mailove-aliasy-a-proxy-sluzby-simplelogin-addy-io-firefox-relay-a-proxiedmail-v-praxi\/\">OpenPGP<\/a> avec des cl\u00e9s ECC (cryptographie \u00e0 courbe elliptique) et RSA. Ces algorithmes sont encore s\u00fbrs pour les ordinateurs actuels, mais un ordinateur quantique suffisamment puissant pourrait les casser en utilisant l'algorithme dit de Shor, qui peut traiter les probl\u00e8mes math\u00e9matiques sous-jacents \u00e0 RSA et ECC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00c0 partir de mai 2026, Proton Mail proposera une protection optionnelle gr\u00e2ce \u00e0 de nouvelles cl\u00e9s post-quantiques, et ce pour tous les forfaits, y compris la version gratuite.<\/strong> Une fois activ\u00e9, le compte peut g\u00e9n\u00e9rer et utiliser des cl\u00e9s r\u00e9sistantes aux attaques quantiques pour les nouveaux e-mails chiffr\u00e9s envoy\u00e9s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce qu&#x27;il faut savoir :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La garantie s&#x27;applique <strong>uniquement pour les nouveaux messages<\/strong> \u2014 Les anciens e-mails ne seront pas r\u00e9encrypt\u00e9s r\u00e9troactivement.<\/li>\n\n\n\n<li>Le poste requiert <strong>Mises \u00e0 jour des applications Proton<\/strong>; les versions ant\u00e9rieures ne le prennent pas en charge.<\/li>\n\n\n\n<li>Si vous avez activ\u00e9 <strong>Routage des e-mails avec chiffrement de bout en bout<\/strong>, la protection post-quantique le suspendra temporairement \u2014 ces deux fonctionnalit\u00e9s ne sont pas encore compatibles (comme indiqu\u00e9 dans la documentation officielle de Proton).<\/li>\n\n\n\n<li>Proton ajoute \u00e9galement la prise en charge <strong>OpenPGP v6<\/strong>, une norme plus r\u00e9cente capable de prendre en charge les algorithmes post-quantiques. Il collabore \u00e9galement avec le projet <a href=\"https:\/\/vsx.is\/fr\/thunderbird-pro-open-source-odpoved-na-gmail-a-office-365\/\">Thunderbird<\/a>, afin que les e-mails r\u00e9sistants aux attaques quantiques fonctionnent \u00e9galement entre diff\u00e9rents fournisseurs.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comment activer la protection post-quantique dans Proton Mail<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La configuration ne n\u00e9cessite que quelques clics :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Connectez-vous sur <strong>account.proton.me<\/strong> et ouvrez les param\u00e8tres du compte.<\/li>\n\n\n\n<li>Dans le menu lat\u00e9ral, s\u00e9lectionnez <strong>Cryptage et cl\u00e9s<\/strong> (Cryptage et cl\u00e9s).<\/li>\n\n\n\n<li>Dans la section <strong>Protection post-quantique<\/strong> cliquez sur <strong>Activer la protection post-quantique<\/strong>.<\/li>\n\n\n\n<li>Lisez le message de confirmation, cochez la case pour donner votre accord, puis cliquez sur <strong>Activer et g\u00e9n\u00e9rer des cl\u00e9s<\/strong>. Pour confirmer, vous serez invit\u00e9 \u00e0 saisir votre mot de passe.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Et voil\u00e0, c&#x27;est fait. Une fois activ\u00e9es, ces cl\u00e9s se g\u00e8rent de la m\u00eame mani\u00e8re que les cl\u00e9s RSA ou ECC existantes : vous pouvez en g\u00e9n\u00e9rer plusieurs, les marquer comme obsol\u00e8tes ou compromises, ou encore les t\u00e9l\u00e9charger pour les utiliser avec d&#x27;autres services compatibles PGP. Sur du mat\u00e9riel moderne, l&#x27;impact sur les performances est g\u00e9n\u00e9ralement n\u00e9gligeable.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Qui d&#x27;autre propose un cryptage post-quantique ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Proton n&#x27;est ni le premier ni le seul. La migration vers le PQC s&#x27;est acc\u00e9l\u00e9r\u00e9e ces deux derni\u00e8res ann\u00e9es dans l&#x27;ensemble du secteur. Passons en revue les principaux acteurs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tuta Mail \u2014 pionnier des e-mails post-quantiques<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Allemand <a href=\"https:\/\/vsx.is\/fr\/top-10-e-mailovych-sluzeb\/\">Tuta<\/a> (anciennement <a href=\"https:\/\/vsx.is\/fr\/soukrome-e-mailove-sluzby-ktere-opravdu-chrani-vasi-postu\/\">Tutanota<\/a>) a pr\u00e9sent\u00e9 son propre protocole hybride <strong><a href=\"https:\/\/vsx.is\/fr\/tuta-nemecky-prukopnik-sifrovaneho-e-mailu\/\">TutaCrypt<\/a><\/strong> en mars 2024, devenant ainsi le premier fournisseur de messagerie \u00e9lectronique au monde \u00e0 lancer <a href=\"https:\/\/vsx.is\/fr\/proton-mail-vs-tuta-mail-co-chystaji-nejznamejsi-sifrovane-e-maily-v-roce-2026\/\">cryptage post-quantique<\/a> par d\u00e9faut pour les nouveaux comptes. TutaCrypt combine des algorithmes classiques (X25519, AES-256) avec l&#x27;algorithme post-quantique CRYSTALS-Kyber.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En avril 2026, Tuta a lanc\u00e9 une plateforme ferm\u00e9e <a href=\"https:\/\/vsx.is\/fr\/thunderbird-pro-co-noveho-prinesl-duben-2026\/\">b\u00eata<\/a> version du stockage dans le cloud <strong><a href=\"https:\/\/vsx.is\/fr\/tuta-drive-spousti-uzavrenou-betu-post-kvantove-cloudove-uloziste-z-nemecka-vstupuje-do-dalsi-faze\/\">Tuta Drive<\/a><\/strong>, qui utilise le m\u00eame protocole hybride pour <a href=\"https:\/\/vsx.is\/fr\/srovnani-platforem-pro-okamzite-zasilani-zprav\/\">chiffrement de bout en bout<\/a> fichiers \u2014 ce que ni Google Drive ni OneDrive ne permettent pour l&#x27;instant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Principale diff\u00e9rence par rapport \u00e0 Proton Mail :<\/strong> Tuta active le PQC par d\u00e9faut pour les nouveaux comptes, tandis que Proton le propose en option. En revanche, Tuta n&#x27;utilise pas OpenPGP, ce qui le rend incompatible avec les outils PGP externes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Apple iMessage \u2014 protocole PQ3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">En f\u00e9vrier 2024, Apple a pr\u00e9sent\u00e9 un protocole pour iMessage <strong>PQ3<\/strong>, qu&#x27;Apple pr\u00e9sente comme le premier service de messagerie grand public dot\u00e9 d&#x27;un \u201e niveau de s\u00e9curit\u00e9 3 \u00bb. PQ3 utilise la cryptographie post-quantique non seulement pour l&#x27;\u00e9tablissement initial des cl\u00e9s, mais aussi tout au long de la conversation : gr\u00e2ce au renouvellement r\u00e9gulier des cl\u00e9s (rekeying), un pirate qui parviendrait \u00e0 d\u00e9chiffrer une cl\u00e9 ne pourrait lire qu&#x27;une partie limit\u00e9e des messages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PQ3 est disponible sur iOS 17.4, iPadOS 17.4, macOS 14.4 et watchOS 10.4 et versions ult\u00e9rieures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Signal \u2014 PQXDH \u00e0 partir de septembre 2023<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Applications de communication <a href=\"https:\/\/vsx.is\/fr\/bezpecne-messangery\/\">Signal<\/a> a \u00e9t\u00e9 la toute premi\u00e8re application de messagerie grand public \u00e0 adopter la cryptographie post-quantique. Le protocole <strong>PQXDH<\/strong> (Post-Quantum Extended Diffie-Hellman) l&#x27;a d\u00e9j\u00e0 mis en place en septembre 2023 et l&#x27;utilise pour l&#x27;\u00e9change initial de cl\u00e9s dans les nouvelles conversations s\u00e9curis\u00e9es. Avec son PQ3, Apple va encore plus loin (en prot\u00e9geant \u00e9galement l&#x27;\u00e9change continu de messages), mais c&#x27;est Signal qui d\u00e9tient la palme du premier d\u00e9ploiement de la PQC dans une application de messagerie populaire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cloudflare et les navigateurs \u2014 Le PQC dans TLS, nouvelle norme du Web<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le chiffrement post-quantique ne concerne plus depuis longtemps uniquement les services de messagerie \u00e9lectronique. En avril 2026, Cloudflare a annonc\u00e9 que <strong>plus de 65 % du trafic web humain<\/strong> le trafic transitant par son r\u00e9seau est d\u00e9sormais prot\u00e9g\u00e9 par un \u00e9change de cl\u00e9s post-quantique hybride (combinaison X25519 + Kyber\/ML-KEM) dans <a href=\"https:\/\/vsx.is\/fr\/bezpecny-e-mail-co-to-vlastne-znamena-a-potrebujete-to-resit\/\">TLS<\/a> 1.3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela fonctionne parce que les principaux navigateurs \u2014 <strong><a href=\"https:\/\/vsx.is\/fr\/rss-a-prohlizece-proc-se-jejich-cesty-rozesly-a-jak-spravovat-feedy-v-roce-2026\/\">Chrome<\/a>, Edge et <a href=\"https:\/\/vsx.is\/fr\/top-10-webovych-prohlizecu-pro-windows\/\">Firefox<\/a><\/strong> \u2014 ont progressivement activ\u00e9 la prise en charge de l&#x27;\u00e9change de cl\u00e9s PQC hybride par d\u00e9faut. Si vous utilisez la derni\u00e8re version <a href=\"https:\/\/vsx.is\/fr\/firefox-forky-proc-existuji-a-ktery-si-vybrat\/\">navigateur<\/a> et que vous consultez un site web h\u00e9berg\u00e9 par Cloudflare, il y a de fortes chances que l&#x27;\u00e9change de cl\u00e9s TLS lui-m\u00eame s&#x27;effectue d\u00e9j\u00e0 selon un mode hybride post-quantique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela ne signifie toutefois pas que l&#x27;ensemble du site web <a href=\"https:\/\/vsx.is\/fr\/jeden-ekosystem-nebo-digitalni-mozaika-tri-cesty-k-organizaci-online-zivota\/\">\u00c9cosyst\u00e8me<\/a> termin\u00e9. <strong>Authentification et certificats TLS<\/strong> Il s&#x27;agit d&#x27;une autre \u00e9tape, nettement plus complexe, de la migration \u2014 Cloudflare pr\u00e9voit de l&#x27;achever d&#x27;ici 2029.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Google et Microsoft : des avanc\u00e9es prudentes au-del\u00e0 du stockage dans le cloud<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les services de stockage grand public Google Drive et OneDrive, aucun d\u00e9ploiement de la PQC pour les donn\u00e9es des utilisateurs n&#x27;a encore \u00e9t\u00e9 annonc\u00e9 publiquement. Cependant, la migration g\u00e9n\u00e9rale est d\u00e9j\u00e0 en cours chez les deux entreprises : Google vise l&#x27;ann\u00e9e 2029 pour une transition compl\u00e8te vers la technologie post-quantique. <a href=\"https:\/\/vsx.is\/fr\/proc-jsou-wordpress-pluginy-bezpecnostni-nocni-mura-a-jak-to-resi-emdash\/\">S\u00e9curit\u00e9<\/a> de ses services, et Microsoft a d\u00e9j\u00e0 mis \u00e0 disposition l&#x27;API PQC dans Windows Server 2025, Windows 11 et .NET 10. Cela ne signifie toutefois pas pour autant que tes fichiers stock\u00e9s sur Drive ou OneDrive b\u00e9n\u00e9ficient d&#x27;ores et d\u00e9j\u00e0 d&#x27;un chiffrement de bout en bout r\u00e9sistant \u00e0 l&#x27;informatique quantique.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Comparaison succincte<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Service<\/th><th>Protection post-quantique<\/th><th>\u00c9tat<\/th><th>Algorithme \/ remarque<\/th><\/tr><\/thead><tbody><tr><td><strong>Proton Mail<\/strong><\/td><td>Nouveaux e-mails crypt\u00e9s<\/td><td>Disponible \u00e0 partir de mai 2026, y compris la formule gratuite<\/td><td>Cl\u00e9s OpenPGP v6 compatibles PQC<\/td><\/tr><tr><td><strong><a href=\"https:\/\/vsx.is\/fr\/foss-alternativy-dil-2-komunikace-a-socialni-site-kde-prechod-boli-nejvic\/\">Tuta Mail<\/a><\/strong><\/td><td>E-mail, calendrier, contacts<\/td><td>Par d\u00e9faut pour les nouveaux comptes \u00e0 partir de mars 2024<\/td><td>TutaCrypt (CRYSTALS-Kyber + X25519 + AES-256)<\/td><\/tr><tr><td><strong>Apple iMessage<\/strong><\/td><td>Actualit\u00e9s<\/td><td>Disponible \u00e0 partir d&#x27;iOS 17.4 (2024)<\/td><td>PQ3 \u2014 Apple le d\u00e9signe comme \u201e niveau de s\u00e9curit\u00e9 3 \u00bb<\/td><\/tr><tr><td><strong>Signal<\/strong><\/td><td>Actualit\u00e9s<\/td><td>\u00c0 partir de septembre 2023<\/td><td>PQXDH ; PQC lors de l&#x27;\u00e9change initial de cl\u00e9s<\/td><\/tr><tr><td><strong>Cloudflare + navigateurs<\/strong><\/td><td>\u00c9change de cl\u00e9s HTTPS \/ TLS<\/td><td>Plus de 65 % de trafic passager (avril 2026)<\/td><td>Hybride X25519 + ML-KEM\/Kyber ; l&#x27;authentification constitue la phase suivante<\/td><\/tr><tr><td><strong>Google Drive \/ OneDrive<\/strong><\/td><td>Consommation <a href=\"https:\/\/vsx.is\/fr\/top-5-cloudovych-ulozist\/\">stockage en nuage<\/a><\/td><td>Pas d&#x27;informations concernant les donn\u00e9es utilisateur<\/td><td>La migration g\u00e9n\u00e9rale de Google est pr\u00e9vue pour 2029, Microsoft dispose d&#x27;une API PQC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi s&#x27;en pr\u00e9occuper d\u00e8s maintenant ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L&#x27;argument est simple, et Proton et Tuta le soulignent tous deux de la m\u00eame mani\u00e8re : <strong>Un pirate informatique peut collecter aujourd&#x27;hui des donn\u00e9es crypt\u00e9es et les conserver, sachant qu&#x27;il les d\u00e9cryptera dans cinq ou dix ans, d\u00e8s qu&#x27;il aura acc\u00e8s \u00e0 un ordinateur quantique suffisamment puissant.<\/strong> D\u00e8s que de telles attaques deviendront techniquement possibles, il sera trop tard pour se prot\u00e9ger.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les changements importants en mati\u00e8re de s\u00e9curit\u00e9 ont toujours commenc\u00e9 en silence, bien avant que le grand public ne s&#x27;en aper\u00e7oive. Ceux qui attendent que le probl\u00e8me soit \u00e9vident pour tout le monde ont g\u00e9n\u00e9ralement d\u00e9j\u00e0 rat\u00e9 le coche.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous utilisez Proton Mail, <strong>L&#x27;activation de la protection post-quantique prend une minute<\/strong> et cela ne co\u00fbte rien. Si vous pr\u00e9f\u00e9rez \u201e PQC par d\u00e9faut \u201c, rendez-vous sur Tutu. Et si vous vous contentez de savoir que votre navigation sur le Web s&#x27;effectue d\u00e9j\u00e0 via un \u00e9change de cl\u00e9s r\u00e9sistant aux attaques quantiques, f\u00e9licitations : avec la derni\u00e8re version de Chrome ou de Firefox, vous l&#x27;utilisez tr\u00e8s probablement sans avoir rien fait de particulier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&#x27;\u00e8re quantique n&#x27;est pas encore arriv\u00e9e. Mais les pr\u00e9paratifs battent leur plein \u2014 et avancent plus vite qu&#x27;on ne le pense.<\/p>","protected":false},"excerpt":{"rendered":"<p>Kvantov\u00e9 po\u010d\u00edta\u010de zat\u00edm dne\u0161n\u00ed e-mailov\u00e9 \u0161ifrov\u00e1n\u00ed v praxi nel\u00e1mou. Riziko ale spo\u010d\u00edv\u00e1 v tom, \u017ee \u00fato\u010dn\u00edci mohou \u0161ifrovan\u00e1 data sb\u00edrat [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","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":""}},"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"federated","footnotes":""},"categories":[22],"tags":[],"class_list":["post-658","post","type-post","status-publish","format-standard","hentry","category-digitalni-soukromi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Postkvantov\u00e9 \u0161ifrov\u00e1n\u00ed p\u0159ich\u00e1z\u00ed: Proton Mail spou\u0161t\u00ed ochranu p\u0159ed kvantov\u00fdmi po\u010d\u00edta\u010di. 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