In cryptography, the S-1 block cipher was a block cipher posted in source code form on Usenet on 11 August 1995.[1] Although incorrect security markings immediately indicated a hoax, there were several features of the code which suggested it might be leaked source code for the Skipjack cipher, which was still classified at the time.
However once David Wagner had discovered a severe[2]design flaw, involving the key schedule but not the underlying round function, it was generally accepted as being a hoax—but one with an astonishing amount of work behind it. Bruce Schneier noted that S-1 contained a feature never seen before in the open literature; a G-table that results in key and data dependent rotation of S-boxes to use in a given round.[3] When Skipjack was eventually declassified in 1998, it was indeed found to be totally unlike S-1.
ReferencesEdit
^Anonymous (1995-08-09). "this looked like it might be interesting". Newsgroup: sci.crypt. Usenet: 40b50l$oa8@utopia.hacktic.nl. Retrieved 2009-05-28.
block, cipher, other, uses, disambiguation, cryptography, block, cipher, posted, source, code, form, usenet, august, 1995, although, incorrect, security, markings, immediately, indicated, hoax, there, were, several, features, code, which, suggested, might, lea. For other uses see S1 disambiguation In cryptography the S 1 block cipher was a block cipher posted in source code form on Usenet on 11 August 1995 1 Although incorrect security markings immediately indicated a hoax there were several features of the code which suggested it might be leaked source code for the Skipjack cipher which was still classified at the time However once David Wagner had discovered a severe 2 design flaw involving the key schedule but not the underlying round function it was generally accepted as being a hoax but one with an astonishing amount of work behind it Bruce Schneier noted that S 1 contained a feature never seen before in the open literature a G table that results in key and data dependent rotation of S boxes to use in a given round 3 When Skipjack was eventually declassified in 1998 it was indeed found to be totally unlike S 1 References Edit Anonymous 1995 08 09 this looked like it might be interesting Newsgroup sci crypt Usenet 40b50l oa8 utopia hacktic nl Retrieved 2009 05 28 Cryptanalysis of S 1 Aug 27 1995 The S 1 Algorithm Sep 6 1995 See also EditIraqi block cipher This cryptography related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title S 1 block cipher amp oldid 1084904186, wikipedia, wiki, book, books, library,
