DEAL
In cryptography, DEAL (Data Encryption Algorithm with Larger blocks) is a symmetric block cipher derived from the Data Encryption Standard (DES). The design was proposed in a report by Lars Knudsen in 1998, and was submitted to the AES contest by Richard Outerbridge (who notes that Knudsen had presented the design at the SAC conference in 1997).
![]() Round function of DEAL | |
General | |
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Designers | Lars Knudsen |
First published | 1998 |
Derived from | DES |
Related to | Ladder-DES |
Cipher detail | |
Key sizes | 128, 192 or 256 bits |
Block sizes | 128 bits |
Structure | Nested Feistel network |
Rounds | 6 (128- and 192-bit key) or 8 (256-bit key) |
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. For key sizes of 128 and 192 bits, the cipher uses 6 rounds, increasing to 8 for the 256-bits size. The scheme has a comparable performance to Triple DES, and was relatively slow compared to many other AES candidates.
See also
External links
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
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