{"id":1541,"date":"2024-11-25T15:10:34","date_gmt":"2024-11-25T14:10:34","guid":{"rendered":"https:\/\/www.scouts-europe.org\/scoutorama\/?p=1541"},"modified":"2025-02-11T14:57:17","modified_gmt":"2025-02-11T13:57:17","slug":"alphabet-decale","status":"publish","type":"post","link":"https:\/\/www.scouts-europe.org\/scoutorama\/alphabet-decale\/","title":{"rendered":"Alphabet d\u00e9cal\u00e9"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1541\" class=\"elementor elementor-1541\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8041808 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8041808\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7caf085\" data-id=\"7caf085\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4eb47f7 elementor-widget elementor-widget-heading\" data-id=\"4eb47f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Alphabet decal\u00e9<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-721ab5e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"721ab5e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d46eb97\" data-id=\"d46eb97\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c306bc5 elementor-widget elementor-widget-spacer\" data-id=\"c306bc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f4c36d elementor-widget elementor-widget-text-editor\" data-id=\"4f4c36d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div id=\"chapo_article\"><div id=\"chapo_article li\"><p>Voici un code bas\u00e9 sur le d\u00e9calage de l\u2019alphabet.<\/p><p>L\u2019id\u00e9al serait \u00e9videmment de d\u00e9caler les lettres selon un ordre absolument fantaisiste d\u2019un bout \u00e0 l\u2019autre du message, ce qui est \u00e0 peu pr\u00e8s impraticable pour des scouts, car le d\u00e9chiffrement donnerait de telles migraines \u00e0 ton correspondant qu\u2019il pr\u00e9f\u00e8rerait y renoncer.<br \/>Mais pour cela, un nomm\u00e9 Blaise de VIGENERE a invent\u00e9, sous le r\u00e8gne d\u2019Henri III, un proc\u00e9d\u00e9 fort pratique, pour chiffrer de cette mani\u00e8re.<\/p><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d924bf9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d924bf9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1730870\" data-id=\"1730870\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dc64d2e elementor-widget elementor-widget-heading\" data-id=\"dc64d2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Table de Vigenere<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1f26f0e elementor-widget elementor-widget-text-editor\" data-id=\"1f26f0e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Examine un peu la table. C\u2019est un carr\u00e9 divis\u00e9 en 676 cases dans lesquelles les lettres de l\u2019alphabet sont dispos\u00e9es comme dans une table de Pythagore avec cette diff\u00e9rence que quand on est arriv\u00e9 \u00e0 Z on fait suivre \u00e0 A et la suite sans interruption. Et maintenant, suis bien l\u2019op\u00e9ration.<\/p><p>A B C D E F G H I J K L M N O P Q R S T U V W X Y Z<br \/>B C D E F G H I J K L M N O P Q R S T U V W X Y Z A<br \/>C D E F G H I J K L M N O P Q R S T U V W X Y Z A B<br \/>D E F G H I J K L M N O P Q R S T U V W X Y Z A B C<br \/>E F G H I J K L M N O P Q R S T U V W X Y Z A B C D<br \/>F G H I J K L M N O P Q R S T U V W X Y Z A B C D E<br \/>G H I J K L M N O P Q R S T U V W X Y Z A B C D E F<br \/>H I J K L M N O P Q R S T U V W X Y Z A B C D E F G<br \/>I J K L M N O P Q R S T U V W X Y Z A B C D E F G H<br \/>J K L M N O P Q R S T U V W X Y Z A B C D E F G H I<br \/>K L M N O P Q R S T U V W X Y Z A B C D E F G H I J<br \/>L M N O P Q R S T U V W X Y Z A B C D E F G H I J K<br \/>M N O P Q R S T U V W X Y Z A B C D E F G H I J K L<br \/>N O P Q R S T U V W X Y Z A B C D E F G H I J K L M<br \/>O P Q R S T U V W X Y Z A B C D E F G H I J K L M N<br \/>P Q R S T U V W X Y Z A B C D E F G H I J K L M N O<br \/>Q R S T U V W X Y Z A B C D E F G H I J K L M N O P<br \/>R S T U V W X Y Z A B C D E F G H I J K L M N O P Q<br \/>S T U V W X Y Z A B C D E F G H I J K L M N O P Q R<br \/>T U V W X Y Z A B C D E F G H I J K L M N O P Q R S<br \/>U V W X Y Z A B C D E F G H I J K L M N O P Q R S T<br \/>V W X Y Z A B C D E F G H I J K L M N O P Q R S T U<br \/>W X Y Z A B C D E F G H I J K L M N O P Q R S T U V<br \/>X Y Z A B C D E F G H I J K L M N O P Q R S T U V W<br \/>Y Z A B C D E F G H I J K L M N O P Q R S T U V W X<br \/>Z A B C D E F G H I J K L M N O P Q R S T U V W X Y<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d729aa6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d729aa6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-51648cf\" data-id=\"51648cf\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5cac87b elementor-widget elementor-widget-heading\" data-id=\"5cac87b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Pour chiffrer<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-26af085 elementor-widget elementor-widget-text-editor\" data-id=\"26af085\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Nous allons utiliser les colonnes pour les lettres du mot cl\u00e9 et les lignes pour celles du message. Ainsi, nous allons chiffrer \u00e0 l\u2019aide du mot SCOUT le message \u00ab\u00a0Il est important de\u2026\u00a0\u00bb.<\/p><p>Posant la pointe de mon crayon sur la colonne signal\u00e9e en haut par un S, je vais descendre jusqu\u2019\u00e0 la ligne au d\u00e9but de laquelle se trouve la lettre I.<br \/>\u00c0 l\u2019intersection des deux, je rencontre la lettre chiffr\u00e9e A qui est celle que j\u2019inscrit dans mon message. Continuons.<br \/>Colonne de la lettre C, ligne de la lettre L, on obtient la lettre chiffr\u00e9e N. Ainsi de suite. Le message devient\u00a0: A N S M M L T S M B E R C\u2026<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-242c658 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"242c658\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ea0d808\" data-id=\"ea0d808\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1c5a77a elementor-widget elementor-widget-heading\" data-id=\"1c5a77a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Pour d\u00e9chiffrer<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c8c1f27 elementor-widget elementor-widget-text-editor\" data-id=\"c8c1f27\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>On fait l\u2019op\u00e9ration inverse. On prendra la colonne qui commence par la premi\u00e8re lettre du mot cl\u00e9 (S) et on descendra jusqu\u2019\u00e0 ce qu\u2019on rencontre la premi\u00e8re lettre du message chiffr\u00e9. Suivant alors la ligne sur la gauche, on aboutira \u00e0 la derni\u00e8re lettre qui est celle du texte en clair.<\/p><p>Ajoutons qu\u2019\u00e0 la place du mot cl\u00e9 on peut choisir une phrase ou m\u00eame un texte cl\u00e9 susceptible d\u2019\u00eatre appris par c\u0153ur ou tir\u00e9 d\u2019un livre que le destinataire poss\u00e8de.<br \/>Pour rendre le message plus imp\u00e9n\u00e9trable, il est possible de le chiffrer deux fois en utilisant soit la m\u00eame cl\u00e9 soit une cl\u00e9 diff\u00e9rente.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Voici un code bas\u00e9 sur le d\u00e9calage de l\u2019alphabet.<br \/>\nL\u2019id\u00e9al serait \u00e9videmment de d\u00e9caler les lettres selon un ordre absolument fantaisiste d\u2019un bout \u00e0 l\u2019autre du message, ce qui est \u00e0 peu pr\u00e8s impraticable pour des scouts, car le d\u00e9chiffrement donnerait de telles migraines \u00e0 ton correspondant qu\u2019il pr\u00e9f\u00e8rerait y renoncer.<br \/>\nMais pour cela, un nomm\u00e9 Blaise de VIGENERE a invent\u00e9, sous le r\u00e8gne d\u2019Henri III, un proc\u00e9d\u00e9 fort pratique, pour chiffrer de cette mani\u00e8re.<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","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":"","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[64,24],"tags":[],"class_list":["post-1541","post","type-post","status-publish","format-standard","hentry","category-codes-secrets","category-transmissions"],"_links":{"self":[{"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/posts\/1541","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/comments?post=1541"}],"version-history":[{"count":10,"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/posts\/1541\/revisions"}],"predecessor-version":[{"id":6623,"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/posts\/1541\/revisions\/6623"}],"wp:attachment":[{"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/media?parent=1541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/categories?post=1541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.scouts-europe.org\/scoutorama\/wp-json\/wp\/v2\/tags?post=1541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}