{"id":5784,"date":"2021-02-10T13:45:48","date_gmt":"2021-02-10T12:45:48","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?p=5784"},"modified":"2021-04-07T10:21:54","modified_gmt":"2021-04-07T08:21:54","slug":"une-carte-de-machine-a-cafe-nespresso-piratee","status":"publish","type":"post","link":"https:\/\/www.mathweb.fr\/euclide\/2021\/02\/10\/une-carte-de-machine-a-cafe-nespresso-piratee\/","title":{"rendered":"Une carte de machine \u00e0 caf\u00e9 Nespresso pirat\u00e9e"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Je suis tomb\u00e9 il y a quelques jours sur une actualit\u00e9 (sur le site <a href=\"https:\/\/www.01net.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.01net.com\/<\/a>), qui relate le fait qu&rsquo;une carte de machine \u00e0 caf\u00e9 Nespresso a \u00e9t\u00e9 pirat\u00e9e.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">On peut lire dans cet article que le montant de la carte ainsi pirat\u00e9e a \u00e9t\u00e9 mis \u00e0 son maximum :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Tout ce que le hacker a eu besoin de faire ensuite, c\u2019est de modifier les donn\u00e9es export\u00e9es et de les recharger sur la carte. Il a \u00e9videmment choisi le maximum possible : 167\u2009772,15 euros. De quoi boire du caf\u00e9 pendant de nombreuses ann\u00e9es.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Mais pourquoi un tel montant ?<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"984\" height=\"619\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2021\/02\/carte-nespresso.jpg\" alt=\"carte nespresso machine \u00e0 caf\u00e9 pirat\u00e9e\" class=\"wp-image-5785\" srcset=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2021\/02\/carte-nespresso.jpg 984w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2021\/02\/carte-nespresso-600x377.jpg 600w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2021\/02\/carte-nespresso-300x189.jpg 300w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2021\/02\/carte-nespresso-768x483.jpg 768w\" sizes=\"auto, (max-width: 984px) 100vw, 984px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Carte de machine \u00e0 caf\u00e9 Nespresso pirat\u00e9e: pourquoi un tel montant ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;explication se trouve dans cet autre extrait de l&rsquo;article :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>En comparant deux exportations diff\u00e9rentes de la carte, il (le \u00ab\u00a0pirate\u00a0\u00bb caf\u00e9inomane) a r\u00e9ussi \u00e0 localiser la zone de m\u00e9moire de trois octets sur laquelle est cod\u00e9 le cr\u00e9dit.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ainsi, 3 octets d\u00e9finissent le montant de la carte&#8230; Un octet, c&rsquo;est 8 bits donc 3 octets, cela fait 24 bits. Le montant maximum est donc repr\u00e9sent\u00e9 par 24 \u00ab\u00a01\u00a0\u00bb \u00e0 la suite, qui donnent en d\u00e9cimal:$$2^0+2^1+2^2+\\cdots+2^{23}=2^{24}-1=16777215.$$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On peut donc supposer que les deux derniers chiffres d\u00e9cimaux d\u00e9signent la partie d\u00e9cimale du prix. Cela donne alors un montant maximal de 167772,15\u20ac.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>After doing some more testing and debugging, we come to the conclusion that the card uses 3 bytes to represent the total monetary value on the card. The maximum possible amount of money on one of these cards is therefore \u20ac167.772,15.<\/p><cite><a href=\"https:\/\/pollevanhoof.be\/nuggets\/smart_cards\/nespresso\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/pollevanhoof.be\/nuggets\/smart_cards\/nespresso<\/a><\/cite><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Je suis tomb\u00e9 il y a quelques jours sur une actualit\u00e9 (sur le site https:\/\/www.01net.com\/), qui relate le fait qu&rsquo;une carte de machine \u00e0 caf\u00e9 Nespresso a \u00e9t\u00e9 pirat\u00e9e.<\/p>\n","protected":false},"author":1,"featured_media":5785,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[122],"class_list":["post-5784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informatique","tag-nsi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Une carte de machine \u00e0 caf\u00e9 Nespresso pirat\u00e9e - Mathweb.fr<\/title>\n<meta name=\"description\" content=\"Une carte de machine \u00e0 caf\u00e9 Nespresso a \u00e9t\u00e9 pirat\u00e9e pour y mettre un montant de 167772,15\u20ac. 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