{"id":165,"date":"2025-03-04T20:50:01","date_gmt":"2025-03-04T20:50:01","guid":{"rendered":"http:\/\/localhost\/wordpress\/?page_id=165"},"modified":"2025-07-04T17:23:36","modified_gmt":"2025-07-04T15:23:36","slug":"technical-informations","status":"publish","type":"page","link":"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/index.php\/csa-disc\/technical-informations\/","title":{"rendered":"Technical Informations"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Appearance and dimensions<\/strong><\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The device is made of brass.<\/li>\n\n\n\n<li>The outer disc is 2.25&#8243; (57mm) in diameter and 1mm thick. &#8220;CSA&#8221; is stamped in red in the center, over the smaller letters &#8220;S. S.&#8221; (which appear to also have been red originally, and are commonly thought to mean &#8220;secret service&#8221;). The regular alphabet is stamped in black around the edge.<\/li>\n\n\n\n<li>The inner disc is 1.6&#8243; (41mm) in diameter, 1mm thick and also has a regular alphabet around the edge.<\/li>\n\n\n\n<li>The third disc, on the back, is 1.8&#8243; (46mm) in diameter and is stamped with the text &#8220;F. LABARRE \/ RICHMOND.VA:&#8221;. Its thickness is unknown but may also be 1mm.<\/li>\n\n\n\n<li>The axle is about 1\/4&#8243; (6mm) in diameter.<\/li>\n\n\n\n<li>A knurled flat nut about 3\/4&#8243; (20mm) in diameter holds the parts together.<\/li>\n\n\n\n<li>The device is 0.375&#8243; (9.5mm) thick at its thickest.<\/li>\n\n\n\n<li>The 3 existing devices that have been described show Roman numerals (\u201cIII\u201d, \u201cX\u201d, and \u201cXIIII\u201d) scratched on the back. No information was found about these markings; they might be a production number made by Francis Labarre, or indicate the Army regiment where they were used.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-right\"><strong>Cryptology<\/strong><\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">The device essentially performs a Vigenere polyalphabetic substitution, with discs instead of a table or sliding rulers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The strength of this system depends heavily on the key used. For it to be considered relatively secure, the ratio\u00a0<em>[key length]\u00a0<\/em>\/<em>\u00a0[message length]\u00a0<\/em>must be high enough and\u00a0the key must not be made up of existing words.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Appearance and dimensions Cryptology The device essentially performs a Vigenere polyalphabetic substitution, with discs instead of a table or sliding rulers. The strength of this system depends heavily on the key used. For it to be considered relatively secure, the ratio\u00a0[key length]\u00a0\/\u00a0[message length]\u00a0must be high enough and\u00a0the key must not be made up of existing [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":345,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"wp-custom-template-csa-disc","meta":{"footnotes":""},"class_list":["post-165","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Confederate Cipher Disc | Technical Informations<\/title>\n<meta name=\"description\" content=\"The Confederate Cipher Disc: appearance and dimensions, cryptology\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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