{"id":113,"date":"2025-03-03T17:57:03","date_gmt":"2025-03-03T17:57:03","guid":{"rendered":"http:\/\/localhost\/wordpress\/?page_id=113"},"modified":"2025-04-17T17:50:54","modified_gmt":"2025-04-17T15:50:54","slug":"technical-informations","status":"publish","type":"page","link":"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/index.php\/m-94\/technical-informations\/","title":{"rendered":"Technical Informations"},"content":{"rendered":"\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:66.66%\">\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 from aluminum&nbsp;and&nbsp;weighs about 100g.<\/li>\n\n\n\n<li>The text is die-stamped and filled with black enamel.<\/li>\n\n\n\n<li>The shaft is about 4.5&#8243; (120mm) long and 1\/4&#8243; (6.3mm) in diameter. 1&#8243; is threaded on&nbsp;the right end.<\/li>\n\n\n\n<li>The discs are 1.5&#8243; (38mm) in diameter and about 3\/16&#8243; (4.8mm) thick. They have 26 notches on the left side\u00a0which allow\u00a0them to interlock with a projection on the disc on their left.<\/li>\n\n\n\n<li>The&nbsp;guide rule is attached to he leftmost disc. It has a notch every 5 discs, to indicate a new 5-letter group.<\/li>\n\n\n\n<li>The rightmost disc, or name plate, is stamped &#8220;CIPHER DEVICE \/ M-94 \/ SIGNAL CORPS \/ U.S. ARMY&#8221; or &#8220;CIPHER DEVICE \/ TYPE M-94 \/ SIGNAL CORPS \/ U.S. ARMY&#8221;.<\/li>\n\n\n\n<li>The Navy used an identical device called the CSP-488. The only difference with the M-94 appears to be the name plate, which is stamped &#8220;US NAVY \/ CSP 488&#8221;.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-grid wp-container-core-group-is-layout-58d222ce wp-block-group-is-layout-grid\">\n<p class=\"has-text-align-center wp-container-content-e051a413 wp-block-paragraph\"><em>Images courtesy of the National Cryptologic Museum<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b.png\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b.png\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b-1024x375.png\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"375\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b-1024x375.png\" alt=\"\" class=\"wp-image-374\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b-1024x375.png 1024w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b-300x110.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b-768x281.png 768w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b-1536x562.png 1536w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-6b.png 1869w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>Shaft and thumb screw<\/em><\/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\/m94-8b.png\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-8b.png\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-8b.png\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"330\" height=\"169\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-8b.png\" alt=\"\" class=\"wp-image-376\" style=\"width:330px;height:auto\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-8b.png 330w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-8b-300x154.png 300w\" sizes=\"auto, (max-width: 330px) 100vw, 330px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>Guide rule and disc<\/em><\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border is-style-default\"><a href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-4b.png\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-4b.png\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-4b.png\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"693\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-4b.png\" alt=\"\" class=\"wp-image-372\" style=\"border-style:none;border-width:0px;width:230px;height:auto\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-4b.png 605w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-4b-262x300.png 262w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>Guide rule disc<\/em><\/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\/m94-7b.png\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-7b.png\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-7b.png\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"532\" height=\"528\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-7b.png\" alt=\"\" class=\"wp-image-375\" style=\"width:230px;height:auto\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-7b.png 532w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-7b-300x298.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-7b-150x150.png 150w\" sizes=\"auto, (max-width: 532px) 100vw, 532px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>Name plate<\/em><\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large wp-container-content-e051a413\"><a href=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c.png\" data-src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c.png\" data-thumb=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c-1024x544.png\" class=\"ml-lightbox-enabled\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"544\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c-1024x544.png\" alt=\"\" class=\"wp-image-373\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c-1024x544.png 1024w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c-300x159.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c-768x408.png 768w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m94-5c.png 1235w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\"><em>M-94 cipher device<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-3a88641f wp-block-group-is-layout-flex\">\n<h2 class=\"wp-block-heading\"><strong>Alphabets<\/strong><\/h2>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">The 25 alphabets are:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">B  1: ABCEIGDJFVUYMHTQKZOLRXSPWN<br>C  2: ACDEHFIJKTLMOUVYGZNPQXRWSB<br>D  3: ADKOMJUBGEPHSCZINXFYQRTVWL<br>E  4: AEDCBIFGJHLKMRUOQVPTNWYXZS<br>F  5: AFNQUKDOPITJBRHCYSLWEMZVXG<br>G  6: AGPOCIXLURNDYZHWBJSQFKVMET<br>H  7: AHXJEZBNIKPVROGSYDULCFMQTW<br>I  8: AIHPJOBWKCVFZLQERYNSUMGTDX<br>J  9: AJDSKQOIVTZEFHGYUNLPMBXWCR<br>K 10: AKELBDFJGHONMTPRQSVZUXYWIC<br>L 11: ALTMSXVQPNOHUWDIZYCGKRFBEJ<br>M 12: AMNFLHQGCUJTBYPZKXISRDVEWO<br>N 13: ANCJILDHBMKGXUZTSWQYVORPFE<br>O 14: AODWPKJVIUQHZCTXBLEGNYRSMF<br>P 15: APBVHIYKSGUENTCXOWFQDRLJZM<br>Q 16: AQJNUBTGIMWZRVLXCSHDEOKFPY<br>R 17: <code><mark style=\"background-color:#d7d7d7;color:#ff0000\" class=\"has-inline-color\">ARMYOFTHEUS<\/mark><\/code>ZJXDPCWGQIBKLNV<br>S 18: ASDMCNEQBOZPLGVJRKYTFUIWXH<br>T 19: ATOJYLFXNGWHVCMIRBSEKUPDZQ<br>U 20: AUTRZXQLYIOVBPESNHJWMDGFCK<br>V 21: AVNKHRGOXEYBFSJMUDQCLZWTIP<br>W 22: AWVSFDLIEBHKNRJQZGMXPUCOTY<br>X 23: AXKWREVDTUFOYHMLSIQNJCPGBZ<br>Y 24: <mark style=\"background-color:#d7d7d7;color:#ff0000\" class=\"has-inline-color\">AY<\/mark>JPXMVKBQWUGLOSTECHNZ<mark style=\"background-color:#d7d7d7;color:#ff0000\" class=\"has-inline-color\">FRID<\/mark><br>Z 25: AZDNBUHYFWJLVGRCQMPSOEXTKI<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Notice how R 17&#8217;s alphabet starts with &#8220;ARMYOFTHEUS&#8221;, and Y 24&#8217;s contains &#8220;FRIDAY&#8221;.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Army and Navy devices used the same alphabets, so Navy device CSP-488 bore the text &#8220;ARMYOFTHEUS&#8221;.<\/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-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 M-94 was an easy and convenient device to use. It was secure enough for field use that did not require the message to remain secret for long; the Germans actually broke it during WWII.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If one key is used to encrypt the totality of a long message, the fact that every 25th letter (the 1st and the 26th, the 2nd and the 27th, etc.) is taken from the same alphabet is a vulnerability.<\/p>\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 is actually quite large: 25! (or 1.55 x 10<sup>25<\/sup>) for the order of the discs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One may also consider that, with the discs in the proper order, the correct line or offset must also be selected on the cylinder. The keyspace is then 25! x 26, or 4.03 x 10<sup>26<\/sup>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Note: this is only valid for one 25-letter section; the total keyspace is larger when more sections are considered as the offset can change even if the key is the same.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Appearance and dimensions Images courtesy of the National Cryptologic Museum Alphabets The 25 alphabets are: B 1: ABCEIGDJFVUYMHTQKZOLRXSPWNC 2: ACDEHFIJKTLMOUVYGZNPQXRWSBD 3: ADKOMJUBGEPHSCZINXFYQRTVWLE 4: AEDCBIFGJHLKMRUOQVPTNWYXZSF 5: AFNQUKDOPITJBRHCYSLWEMZVXGG 6: AGPOCIXLURNDYZHWBJSQFKVMETH 7: AHXJEZBNIKPVROGSYDULCFMQTWI 8: AIHPJOBWKCVFZLQERYNSUMGTDXJ 9: AJDSKQOIVTZEFHGYUNLPMBXWCRK 10: AKELBDFJGHONMTPRQSVZUXYWICL 11: ALTMSXVQPNOHUWDIZYCGKRFBEJM 12: AMNFLHQGCUJTBYPZKXISRDVEWON 13: ANCJILDHBMKGXUZTSWQYVORPFEO 14: AODWPKJVIUQHZCTXBLEGNYRSMFP 15: APBVHIYKSGUENTCXOWFQDRLJZMQ 16: AQJNUBTGIMWZRVLXCSHDEOKFPYR 17: ARMYOFTHEUSZJXDPCWGQIBKLNVS 18: ASDMCNEQBOZPLGVJRKYTFUIWXHT 19: ATOJYLFXNGWHVCMIRBSEKUPDZQU 20: [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":323,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"wp-custom-template-m-94","meta":{"footnotes":""},"class_list":["post-113","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>M-94 | Technical Informations<\/title>\n<meta name=\"description\" content=\"Description, alphabets, cryptology of the US Army M-94 cipher device.\" \/>\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\/m-94\/technical-informations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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