{"id":480,"date":"2025-03-17T22:37:21","date_gmt":"2025-03-17T21:37:21","guid":{"rendered":"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/?page_id=480"},"modified":"2025-06-25T12:19:33","modified_gmt":"2025-06-25T10:19:33","slug":"technical-informations","status":"publish","type":"page","link":"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/index.php\/cryptocode\/technical-informations\/","title":{"rendered":"Technical Informations"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Appearance and dimensions<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"wp-block-paragraph\">The overall dimensions of the machine are: 9.5&#8243; (W) x 12.75&#8243; (H) x 11&#8243; (D), or 24.1cm x 32.4cm x 27.9cm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The device consists of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>10 bronze-edge discs with spokes. They each have 4 alphabets stamped around the rim, separated by the alphabet number and a stop. Vowels and the alphabet numbers are red, consonants are black.<\/li>\n\n\n\n<li>A spindle around which the discs and arms rotate.<\/li>\n\n\n\n<li>A knob.<\/li>\n\n\n\n<li>4 quadrant arms stemming on each side of the discs. They can rotate around the spindle, and their ends can be depressed so the register bars they hold prevent the discs from rotating beyond the stops separating the alphabets.<\/li>\n\n\n\n<li>4 numbered register bars. They prevent full rotation of the discs when the quadrant arms&#8217; sleeves are depressed, and are used as markers to read or build up the plain or cipher text.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A support frame.<\/li>\n\n\n\n<li>A beech base with a drawer. The drawer shows an instruction sheet, and can be removed from the base and used as a cradle for the discs when reordering them.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_02-1-rotated-e1742249702540.jpg\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_02-1-rotated-e1742249702540.jpg\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_02-1-rotated-e1742249702540.jpg\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"728\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_02-1-rotated-e1742249702540.jpg\" alt=\"\" class=\"wp-image-516\" style=\"width:288px;height:auto\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_02-1-rotated-e1742249702540.jpg 600w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_02-1-rotated-e1742249702540-247x300.jpg 247w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption class=\"wp-element-caption\">Cryptocode &#8211; Crypto machine pages<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_03.jpg\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_03.jpg\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_03.jpg\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"656\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_03.jpg\" alt=\"\" class=\"wp-image-514\" style=\"width:auto;height:350px\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_03.jpg 600w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode_03-274x300.jpg 274w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>Cryptocode &#8211; Crypto machine pages<\/em><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description.png\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description.png\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description.png\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"986\" height=\"567\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description.png\" alt=\"\" class=\"wp-image-486\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description.png 986w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description-300x173.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/cryptocode-description-768x442.png 768w\" sizes=\"auto, (max-width: 986px) 100vw, 986px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>Description of the Cryptocode &#8211; Commercial pamphlet, National Cryptologic Museum<\/em><\/figcaption><\/figure>\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\">Alphabets<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">A unique feature of the Cryptocode was that it was meant to produce pronouncable ciphertext, which would be cheaper to transmit by telegraph.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This was done by putting all the vowels in the same positions (11 to 16) in every alphabet, and allowing a letter to be enciphered only with a letter at the same position in any of the other 3 alphabets of a disc. Thus, a vowel could only by enciphered by a vowel, and a consonant by a consonant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alphabets have a 2-digit number; the first digit (0 to 9) identifying the disc and the second (1 to 4) the alphabet within the disc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The alphabets for the 10 discs are:<\/p>\n\n\n\n<div class=\"wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow\">\n<pre class=\"wp-block-preformatted has-medium-font-size\" style=\"border-style:none;border-width:0px\">11|MLKJHGFDCB<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EAYUOI<\/mark>ZXWVTSRQPN 12|VTSRQPNMLK<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">YUOIEA<\/mark>JHGFDCBZXW 13|HGFDCBZXWV<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UOIEAY<\/mark>TSRQPNMLKJ 14|PNMLKJHGFD<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">AYUOIE<\/mark>CBZXWVTSRQ<br><br>21|JKLMNPQRST<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">AEIOUY<\/mark>VWXZBCDFGH 22|QRSTVWXZBC<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UYAEIO<\/mark>DFGHJKLMNP 23|NPQRSTVWXZ<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">YAEIOU<\/mark>BCDFGHJKLM 24|FGHJKLMNPQ<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EIOUYA<\/mark>RSTVWXZBCD<br><br>31|GFDCBZXWVT<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UOIEAY<\/mark>SRQPNMLKJH 32|LKJHGFDCBZ<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EAYUOI<\/mark>XWVTSRQPNM 33|RQPNMLKJHG<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">YUOIEA<\/mark>FDCBZXWVTS 34|WVTSRQPNML<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">IEAYUO<\/mark>KJHGFDCBZX<br><br>41|ZBCDFGHJKL<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">OUYAEI<\/mark>MNPQRSTVWX 42|RSTVWXZBCD<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UYAEIO<\/mark>FGHJKLMNPQ 43|MNPQRSTVWX<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">AEIOUY<\/mark>ZBCDFGHJKL 44|BCDFGHJKLM<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">YAEIOU<\/mark>NPQRSTVWXZ<br><br>51|CBZXWVTSRQ<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">AYUOIE<\/mark>PNMLKJHGFD 52|XWVTSRQPNM<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">YUOIEA<\/mark>LKJHGFDCBZ 53|FDCBZXWVTS<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EAYUOI<\/mark>RQPNMLKJHG 54|TSRQPNMLKJ<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">IEAYUO<\/mark>HGFDCBZXWV<br><br>61|STVWXZBCDF<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UYAEIO<\/mark>GHJKLMNPQR 62|LMNPQRSTVW<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">OUYAEI<\/mark>XZBCDFGHJK 63|XZBCDFGHJK<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EIOUYA<\/mark>LMNPQRSTVW 64|WXZBCDFGHJ<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">IOUYAE<\/mark>KLMNPQRSTV\t\t\t<br><br>71|ZXWVTSRQPN<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">IEAYUO<\/mark>MLKJHGFDCB 72|NMLKJHGFDC<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UOIEAY<\/mark>BZXWVTSRQP 73|JHGFDCBZXW<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">YUOIEA<\/mark>VTSRQPNMLK 74|DCBZXWVTSR<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">OIEAYU<\/mark>QPNMLKJHGF<br><br>81|GHJKLMNPQR<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EIOUYA<\/mark>STVWXZBCDF 82|DFGHJKLMNP<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">OUYAEI<\/mark>QRSTVWXZBC 83|KLMNPQRSTV<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">IOUYAE<\/mark>WXZBCDFGHJ 84|PQRSTVWXZB<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">AEIOUY<\/mark>CDFGHJKLMN<br><br>91|QPNMLKJHGF<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">OIEAYU<\/mark>DCBZXWVTSR 92|BZXWVTSRQP<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UOIEAY<\/mark>NMLKJHGFDC 93|SRQPNMLKJH<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">IEAYUO<\/mark>GFDCBZXWVT 94|KJHGFDCBZX<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EAYUOI<\/mark>WVTSRQPNML<br><br>01|HJKLMNPQRS<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">OUYAEI<\/mark>TVWXZBCDFG 02|VWXZBCDFGH<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">EIOUAY<\/mark>JKLMNPQRST 03|CDFGHJKLMN<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">UYAEIO<\/mark>PQRSTVWXZB 04|TVWXZBCDFG<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">AEIOUY<\/mark>HJKLMNPQRS<br><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">They are all built using either the normal or the reversed alphabet (vowels removed),within which vowels \u2014grouped in normal or reversed order\u2014 are inserted at position 11.<\/p>\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-left\">Cryptology<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">This device shows significant cryptographic weaknesses.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No letter is at the same position in differents alphabets on a given disc, so no letter is ever enciphered by itself. This allows cryptanalysts the use of cribs, or guessed plaintext.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>This device aims to produce pronounceable text by encrypting a consonant by a consonant and a vowel by a vowel. Practically, this means that for a given ciphertext vowel the only possible plaintext equivalents are the other 5 vowels. The same is true for consonants, which have only 19 possible plaintext equivalents.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For the same reason, patterns of words (e.g. C-C-V-V-C) can also appear and be a great help to the cryptanalyst.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the same key is used for a message longer than 10 letters, the short periodicity of the alphabets can be exploited.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"text-decoration: underline;\">Keyspace<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The keyspace for a 10-letter text is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10! (order of the discs) x 4<sup>10<\/sup> (choice of the alphabet, for each disc) x 4 (choice of the plaintext register bar) x 3 (choice of the ciphertext register bar) = 45,660,871,065,600<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is a good example showing that the size of a keyspace does not always reflect the security of a system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Appearance and dimensions The overall dimensions of the machine are: 9.5&#8243; (W) x 12.75&#8243; (H) x 11&#8243; (D), or 24.1cm x 32.4cm x 27.9cm. The device consists of: Alphabets A unique feature of the Cryptocode was that it was meant to produce pronouncable ciphertext, which would be cheaper to transmit by telegraph. This was done [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":468,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"wp-custom-template-cryptocode","meta":{"footnotes":""},"class_list":["post-480","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>Cryptocode | Technical Informations<\/title>\n<meta name=\"description\" content=\"Technical description of the Grassi Cryptocode, its use, and cryptanalysis.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/index.php\/cryptocode\/technical-informations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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