In cryptography, DEAL (Data Encryption Algorithm with Larger blocks) is a symmetric block cipher derived from the Data Encryption Standard (DES). Its design was presented by Lars Knudsen at the SAC conference in 1997, and submitted as a proposal to the AES contest in 1998 by Richard Outerbridge. DEAL is a Feistel network which uses DES as the round function. It has a 128-bit block size and a variable key size of either 128, 192, or 256 bits; with 128-bit and 192-bit keys it applies 6 rounds, or 8 rounds with 256-bit keys. It has performance comparable to Triple DES, and was therefore relatively slow among AES candidates.
See also Ladder-DES Luby–Rackoff block cipher
References John Kelsey, Bruce Schneier (August 1999). Key-Schedule Cryptanalysis of DEAL (PDF/PostScript). 6th Annual International Workshop on Selected Areas in Cryptography (SAC '99). Kingston, Ontario: Springer-Verlag. pp. 118–134. Retrieved 2007-08-23. Stefan Lucks: On Security of the 128-Bit Block Cipher DEAL. Fast Software Encryption 1999: 60–70
External links The original DEAL report SCAN's entry for DEAL AES presentation slides (PDF)