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| General | |
|---|---|
| Designers | NSA |
| First published | 1998 (declassified) |
| Cipher detail | |
| Key sizes | 80 bits |
| Block sizes | 64 bits |
| Structure | unbalanced Feistel network[1] |
| Rounds | 32 |
| Best public cryptanalysis | |
| ECRYPT II recommendations note that, as of 2012, ciphers with a key size of 80 bits provide only "Very short-term protection against agencies".[2] NIST recommends not to use Skipjack after 2010.[3] Impossible differential cryptanalysis breaks 31 rounds (but only slightly faster than exhaustive search).[4] | |
In cryptography, Skipjack is a block cipher—an algorithm for encryption—developed by the U.S. National Security Agency (NSA). Initially classified, it was originally intended for use in the controversial Clipper chip. Subsequently, the algorithm was declassified.[5]
- ^ Hoang, Viet Tung; Rogaway, Phillip (2010). "On Generalized Feistel Networks". Advances in Cryptology – CRYPTO 2010. Lecture Notes in Computer Science. Vol. 6223. Springer. pp. 613–630. CiteSeerX 10.1.1.185.3033. doi:10.1007/978-3-642-14623-7_33. ISBN 978-3-642-14622-0.
- ^ Yearly Report on Algorithms and Keysizes (2012), D.SPA.20 Rev. 1.0, ICT-2007-216676 ECRYPT II, 09/2012. Archived July 21, 2013, at the Wayback Machine
- ^ Barker, Elaine; Roginsky, Allen (January 2011). "Transitions: Recommendation for Transitioning the Use of Cryptographic Algorithms and Key Lengths" (PDF). NIST.
- ^ Cite error: The named reference
31round-attackwas invoked but never defined (see the help page). - ^ Schneier, Bruce (July 15, 1998). "Declassifying Skipjack".
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