Cryptology ePrint Archive: Report 2002/003
Square Attacks on Reduced-Round Variants of the Skipjack Block Cipher
Jorge Nakahara Jr and Bart Preneel and Joos Vandewalle
Abstract: This report surveys on a series of Square attacks on reduced-round
versions of the Skipjack block cipher.
{\bf Skipjack} is an iterated block cipher encrypting 64-bit plaintext
blocks into 64-bit ciphertext blocks, using an 80-bit key. Its
design is based on a generalized Feistel Network making up 32 rounds
of two different types. This cipher was developed by the National Security
Agency for the Clipper chip and Fortezza PC card.
Category / Keywords: secret-key cryptography / cryptanalysis, block ciphers
Date: received 4 Jan 2002, last revised 8 Jan 2002
Contact author: jorge nakahara at esat kuleuven ac be
Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | BibTeX Citation
Note: Newest version with new revised complexity summary table at the end
of the paper. It is a bit long, but fully-illustrated :-)
Version: 20020108:152420 (All versions of this report)
Short URL: ia.cr/2002/003
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