{"id":1806,"date":"2016-11-17T12:16:00","date_gmt":"2016-11-17T11:16:00","guid":{"rendered":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/?p=1806"},"modified":"2022-01-03T12:32:41","modified_gmt":"2022-01-03T11:32:41","slug":"les-cles-de-controle","status":"publish","type":"post","link":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/2016\/11\/17\/les-cles-de-controle\/","title":{"rendered":"Les cl\u00e9s de contr\u00f4le"},"content":{"rendered":"\n<p><strong>Dans le cadre de la formation au num\u00e9rique des \u00e9l\u00e8ves, un document qui explique comment sont calcul\u00e9es les cl\u00e9s de contr\u00f4le n\u00e9cessaires \u00e0 la s\u00e9curisation de la saisie des codes bancaires par exemple.<\/strong><\/p>\n\n\n\n<p>Une caisse de supermarch\u00e9, un code barre qui n\u2019est pas lu par le lecteur infra-rouge, un agent de caisse qui tape et retape le code \u00e0 la main parce que la machine n\u2019en veut pas&#8230; Voici un exemple classique de situation o\u00f9 nous semblons subir l&rsquo;opacit\u00e9 du traitement des codes num\u00e9riques.<\/p>\n\n\n\n<p>Jean-Alain Roddier, IA-IPR de math\u00e9matiques va nous expliquer comment ces codes sont construits et \u00e0 quoi servent les clefs qui leur sont associ\u00e9es, en analysant \u00e0 partir de trois exemples (num\u00e9ro de s\u00e9curit\u00e9 sociale, code bancaire et code barre) le m\u00e9canisme de mise en place d&rsquo;une cl\u00e9 de contr\u00f4le sur une suite de chiffres d&rsquo;un code num\u00e9rique.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#e1f1f1\">\u2592 <strong><a href=\"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-content\/uploads\/sites\/6\/2021\/12\/Les_clefs_de_controle.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Les cl\u00e9s de contr\u00f4le<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-pdfemb-pdf-embedder-viewer\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans le cadre de la formation au num\u00e9rique des \u00e9l\u00e8ves, un document qui explique comment sont calcul\u00e9es les cl\u00e9s de contr\u00f4le n\u00e9cessaires \u00e0 la s\u00e9curisation de la saisie des codes [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1549,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":""},"categories":[32],"tags":[],"class_list":{"0":"post-1806","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-formation-au-numerique-des-eleves","8":"czr-hentry"},"_links":{"self":[{"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/posts\/1806","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/comments?post=1806"}],"version-history":[{"count":1,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/posts\/1806\/revisions"}],"predecessor-version":[{"id":1807,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/posts\/1806\/revisions\/1807"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/media\/1549"}],"wp:attachment":[{"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/media?parent=1806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/categories?post=1806"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pedagogie.ac-clermont.fr\/numerique-educatif\/wp-json\/wp\/v2\/tags?post=1806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}