{"id":1352,"date":"2017-04-10T16:01:04","date_gmt":"2017-04-10T14:01:04","guid":{"rendered":"https:\/\/www.m-q.ch\/?p=1352"},"modified":"2017-04-12T09:52:52","modified_gmt":"2017-04-12T07:52:52","slug":"la-blockchain-un-potentiel-et-un-danger","status":"publish","type":"post","link":"https:\/\/www.m-q.ch\/fr\/blockchain-potenzial-und-gefahr-zugleich\/","title":{"rendered":"Blockchain : potentiel et danger \u00e0 la fois"},"content":{"rendered":"<figure id=\"attachment_1353\" aria-describedby=\"caption-attachment-1353\" style=\"width: 640px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1353\" src=\"https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015.jpg\" alt=\"\" width=\"640\" height=\"427\" srcset=\"https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015.jpg 640w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015-16x12.jpg 16w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015-262x175.jpg 262w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015-525x350.jpg 525w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015-300x200.jpg 300w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_123837850_m-2015-624x416.jpg 624w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption id=\"caption-attachment-1353\" class=\"wp-caption-text\">L'Organisation internationale de normalisation (ISO) a d\u00e9j\u00e0 form\u00e9 un comit\u00e9 qui vise \u00e0 r\u00e9glementer les cha\u00eenes de production au niveau international. (Image : depositphotos_\u00a9 mikkolem)<\/figcaption><\/figure>\n<p>La technologie des cha\u00eenes de production est en plein essor. Huit ans apr\u00e8s l'\u00e9mergence de la cha\u00eene de blocs de bitcoins originale, de nombreux efforts sont d\u00e9ploy\u00e9s pour progresser dans de nombreuses industries gr\u00e2ce aux avantages de cette technologie en mati\u00e8re de s\u00e9curit\u00e9. Mais quels sont les avantages pour les utilisateurs et pour les entreprises ? Et quels sont les nouveaux d\u00e9fis qu'elle pr\u00e9sente ?<\/p>\n<p><strong>La s\u00e9curit\u00e9 de la prochaine g\u00e9n\u00e9ration<\/strong><\/p>\n<p>Tout d'abord, une cha\u00eene de blocs peut \u00eatre comprise comme une base de donn\u00e9es qui fournit la base technique d'une cryptocourant. L'exemple le plus connu d'une cha\u00eene de blocs est Bitcoin.<\/p>\n<p><strong>Avantage 1 : Transaction directe sans interm\u00e9diaire<\/strong><\/p>\n<p>Le plus grand avantage est la transaction directe des parties. Il n'y a pas de tiers dans le lot qui v\u00e9rifie la fiabilit\u00e9 des joueurs comme un arbitre, par exemple une banque, ou un fiduciaire, comme le service de paiement Paypal.<\/p>\n<p>Mais pourquoi voudrait-on contourner le mod\u00e8le fiduciaire \u00e9prouv\u00e9 ? Apr\u00e8s tout, l'interm\u00e9diaire se charge de mettre l'autre partie \u00e0 l'\u00e9preuve. Mais pouvez-vous faire confiance \u00e0 l'arbitre ? M\u00eame les grandes banques ne sont pas \u00e0 l'abri des manipulations, comme l'ont montr\u00e9 de nombreux rapports dans le pass\u00e9.<\/p>\n<p><strong>Avantage 2 : les modifications ult\u00e9rieures sont exclues<\/strong><\/p>\n<p>Les parties peuvent r\u00e9gler et sceller leur accord elles-m\u00eames, de sorte que la transaction reste visible mais non modifiable. Ce principe exige un comportement quasi honn\u00eate de la part des acteurs.<\/p>\n<p>Le \"gel\" des transactions n\u00e9cessite une technologie diff\u00e9rente de celle utilis\u00e9e auparavant : Bitcoin, par exemple, d\u00e9tient la capacit\u00e9 de calcul d'une petite ville pour stocker ses transactions dans un c\u0153ur num\u00e9rique. D'autres technologies utilisent un algorithme de preuve d'enjeu. Chaque principe a ses propres cons\u00e9quences techniques et \u00e9conomiques. Il n'est donc pas \u00e9tonnant qu'il y ait beaucoup d'exp\u00e9rimentation avec la technologie des cha\u00eenes de blocs, surtout en ce qui concerne l'aspect de la s\u00e9curit\u00e9.<\/p>\n<p>Les partis danois et australiens esp\u00e8rent l'utiliser dans les \u00e9lections en ligne. Il existe des offres pour la notarisation de documents et m\u00eame la prise en compte de la s\u00e9curisation des dossiers m\u00e9dicaux par la technologie de la cha\u00eene de blocage.<\/p>\n<p><strong>Probl\u00e8me 1 : \"Blockwashing\" (lavage de bloc)<\/strong><\/p>\n<p>L'un des plus grands d\u00e9fis \u00e0 relever dans le domaine des technologies de la cha\u00eene de production sera le \"lavage de bloc\" : si une technologie prometteuse se d\u00e9veloppe, elle est cens\u00e9e agir comme un sauveur dans une grande vari\u00e9t\u00e9 de domaines. L'approche au coude \u00e0 coude pour capitaliser sur la nouvelle technologie alimente la courbe pr\u00e9coce du Gartner <a href=\"http:\/\/www.gartner.com\/newsroom\/id\/3412017\">Le cycle de la publicit\u00e9<\/a> . Mais cela conduit aussi \u00e0 un effondrement in\u00e9vitable si la technologie ne r\u00e9pond pas aux attentes - comme on le suppose d\u00e9j\u00e0.<\/p>\n<p>Bien que la d\u00e9centralisation ait \u00e9t\u00e9 consid\u00e9r\u00e9e comme une caract\u00e9ristique importante de la cha\u00eene de blocage initiale, il faut se demander ce que le passage de la technologie aux structures en nuage (chez Microsoft et IBM, entre autres) signifiera pour les performances de s\u00e9curit\u00e9. Alors que tout est s\u00e9curis\u00e9 cryptographiquement, exploit\u00e9 \u00e0 nouveau par une seule partie. La nature originelle de la cha\u00eene de blocs est ainsi \u00e9rod\u00e9e. Plus encore : le marketing de Microsoft joue d\u00e9j\u00e0 avec l'in\u00e9vitable surnom de \"Blockchain as a Service\" et nie donc ouvertement toute id\u00e9e de r\u00e9seau d\u00e9centralis\u00e9 et ind\u00e9pendant.<\/p>\n<p><strong>Probl\u00e8me 2 : Manque de normalisation<\/strong><\/p>\n<p>Le th\u00e8me de la normalisation devra \u00e9galement \u00eatre abord\u00e9 \u00e0 l'avenir. Il existe de nombreuses propositions et solutions pour la technologie des cha\u00eenes de production. Chacun avec ses avantages et ses inconv\u00e9nients. La collaboration ne peut \u00eatre ici que la bonne approche pour d\u00e9finir des normes g\u00e9n\u00e9ralement applicables. L'Organisation internationale de normalisation (ISO) a d\u00e9j\u00e0 form\u00e9 un comit\u00e9 pour examiner les premiers efforts dans ce sens.<\/p>\n<p><strong>Probl\u00e8me 3 : Bons concepts, mauvais code<\/strong><\/p>\n<p>Une autre question essentielle concerne la s\u00e9curit\u00e9. Ce n'est pas parce que le concept de cha\u00eene de blocs offre une s\u00e9curit\u00e9 que la mise en \u0153uvre est s\u00fbre. La Chine, par exemple - qui s'int\u00e9resse \u00e0 sa propre cryptocourant - a r\u00e9cemment analys\u00e9 25 des principaux projets de logiciels li\u00e9s \u00e0 la cha\u00eene de blocage et a d\u00e9couvert d'importantes vuln\u00e9rabilit\u00e9s en mati\u00e8re de s\u00e9curit\u00e9 : Validation de l'entr\u00e9e des mots-cl\u00e9s.<\/p>\n<p><strong>Conclusion : d'abord programmer de mani\u00e8re plus s\u00fbre, puis l'utiliser<\/strong><\/p>\n<p>Les probl\u00e8mes pr\u00e9sent\u00e9s ici ne sont pas seulement th\u00e9oriques. Elles sont plut\u00f4t diam\u00e9tralement oppos\u00e9es aux objectifs de nombreux projets en cha\u00eene. Les bogues dans la mise en \u0153uvre des cha\u00eenes de production sont graves et entra\u00eenent des vuln\u00e9rabilit\u00e9s de s\u00e9curit\u00e9 et des pertes financi\u00e8res massives, comme l'illustre le vol de Zcoins d'une valeur de 400 000 dollars le mois dernier.<\/p>\n<p>Avec le d\u00e9veloppement des logiciels en cha\u00eene, les surfaces d'attaque augmentent \u00e9galement. Un facteur cl\u00e9 \u00e0 cet \u00e9gard sera l'\u00e9laboration intelligente des contrats. Alors que la cha\u00eene de blocage Bitcoin originale ne fournit que des protocoles de transactions num\u00e9riques, les accords plus r\u00e9cents pourraient en fait \u00eatre des programmes qui fonctionnent sur la cha\u00eene de blocage :<\/p>\n<p>Imaginez un contrat juridique remplac\u00e9 par un programme informatique. Au lieu de payer un avocat pour r\u00e9gler le contrat, toutes les parties participantes pourraient l'organiser elles-m\u00eames. La cha\u00eene de blocs fournit un r\u00e9sultat de programme immuable et transparent. Le programme lui-m\u00eame analyse les conditions ext\u00e9rieures et ex\u00e9cute correctement ses clauses. N\u00e9anmoins :<\/p>\n<p>Les programmes informatiques auront toujours des vuln\u00e9rabilit\u00e9s. \u00c0 cet \u00e9gard, la solution pour une technologie de cha\u00eene de blocs s\u00e9curis\u00e9e ne peut r\u00e9sider que dans la programmation en tenant compte des concepts de s\u00e9curit\u00e9 et en corrigeant ainsi les faiblesses de la validation des entr\u00e9es et des sorties, par exemple. Et ce, avant de confier cette technologie \u00e0 une grande partie de l'\u00e9conomie ou de l'utiliser \u00e0 grande \u00e9chelle pour organiser l'Internet des objets, par exemple.<\/p>\n<p><a href=\"http:\/\/www.sophos.com\">http:\/\/www.sophos.com<\/a><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Die Blockchain-Technologie ist auf dem Vormarsch. Acht Jahre nach dem Aufkommen der Original Bitcoin Blockchain, gibt es viele Bem\u00fchungen, mit den Sicherheitsvorteilen der Technologie in zahlreiche Industriezweige vorzusto\u00dfen. Doch welche Vorteile bringt diese den Usern, welche den Unternehmen? Und wie sehen neue Herausforderungen aus, die sich dadurch ergeben? Security der n\u00e4chsten Generation Zun\u00e4chst einmal: Eine [&hellip;]<\/p>\n","protected":false},"author":35,"featured_media":1353,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[3524,3523],"class_list":["post-1352","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unkategorisiert","tag-bitcoins","tag-blockchain"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Blockchain: Potenzial und Gefahr zugleich - MQ Management und Qualit\u00e4t<\/title>\n<meta name=\"description\" content=\"Derzeit braucht man nur das Buzzword Blockchain in einer Runde fallen zu lassen, um die volle Aufmerksamkeit zu bekommen.\" \/>\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.m-q.ch\/fr\/la-blockchain-un-potentiel-et-un-danger\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blockchain: Potenzial und Gefahr zugleich - 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