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- DRYAD abstract "The DRYAD Numeral Cipher/Authentication System (KTC 1400 D) is a simple, paper cryptographic system employed by the U.S. military for authentication and for encryption of short, numerical messages. Each unit with a radio is given a set of matching DRYAD code sheets. A single sheet is valid for a limited time (e.g. 6 hours), called a cryptoperiod.A DRYAD cipher sheet contains 25 lines or rows of scrambled letters. Each line is labeled by the letters A to Y in a column on the left of the page. Each row contains a random permutation of the letters A through Y. The letters in each row are grouped into 10 columns labeled 0 through 9. The columns under 0, 1, 2 and 5 have more letters than the other digits, which have just two each.While crude, the DRYAD Numeral Cipher/Authentication System has the advantage of being fast, relatively easy and requires no extra equipment (such as a pencil). The presence of more cipher-text columns under the digits 0, 1, 2 and 5, is apparently intended to make ciphertext frequency analysis more difficult. But much of the security comes from keeping the cryptoperiod short.DRYAD can be used in two modes, authentication or encryption.".
- DRYAD thumbnail KTV1400D.jpg?width=300.
- DRYAD wikiPageExternalLink authentication.htm.
- DRYAD wikiPageID "845318".
- DRYAD wikiPageLength "4463".
- DRYAD wikiPageOutDegree "18".
- DRYAD wikiPageRevisionID "546754201".
- DRYAD wikiPageWikiLink Authentication.
- DRYAD wikiPageWikiLink BATCO.
- DRYAD wikiPageWikiLink Category:Classical_ciphers.
- DRYAD wikiPageWikiLink Category:National_Security_Agency_encryption_devices.
- DRYAD wikiPageWikiLink Ciphertext.
- DRYAD wikiPageWikiLink Cryptographic.
- DRYAD wikiPageWikiLink Cryptography.
- DRYAD wikiPageWikiLink Cryptoperiod.
- DRYAD wikiPageWikiLink Dryad.
- DRYAD wikiPageWikiLink Encryption.
- DRYAD wikiPageWikiLink Frequency_analysis.
- DRYAD wikiPageWikiLink M-94.
- DRYAD wikiPageWikiLink NATO_phonetic_alphabet.
- DRYAD wikiPageWikiLink Permutation.
- DRYAD wikiPageWikiLink Polyalphabetic_cipher.
- DRYAD wikiPageWikiLink Substitution_cipher.
- DRYAD wikiPageWikiLink United_States.
- DRYAD wikiPageWikiLink File:Encryption_sheet_holder.jpg.
- DRYAD wikiPageWikiLink File:KTV1400D.jpg.
- DRYAD wikiPageWikiLinkText "DRYAD".
- DRYAD hasPhotoCollection DRYAD.
- DRYAD wikiPageUsesTemplate Template:About.
- DRYAD wikiPageUsesTemplate Template:Reflist.
- DRYAD subject Category:Classical_ciphers.
- DRYAD subject Category:National_Security_Agency_encryption_devices.
- DRYAD hypernym Simple.
- DRYAD type Software.
- DRYAD comment "The DRYAD Numeral Cipher/Authentication System (KTC 1400 D) is a simple, paper cryptographic system employed by the U.S. military for authentication and for encryption of short, numerical messages. Each unit with a radio is given a set of matching DRYAD code sheets. A single sheet is valid for a limited time (e.g. 6 hours), called a cryptoperiod.A DRYAD cipher sheet contains 25 lines or rows of scrambled letters. Each line is labeled by the letters A to Y in a column on the left of the page.".
- DRYAD label "DRYAD".
- DRYAD sameAs m.03ghnl.
- DRYAD sameAs Q5206083.
- DRYAD sameAs Q5206083.
- DRYAD wasDerivedFrom DRYAD?oldid=546754201.
- DRYAD depiction KTV1400D.jpg.
- DRYAD isPrimaryTopicOf DRYAD.