| DEAL | |
| Designers: | Lars Knudsen |
| Publish Date: | 1998 |
| Derived From: | DES |
| Related To: | Ladder-DES |
| Key Size: | 128, 192 or 256 bits |
| Block Size: | 128 bits |
| Structure: | Nested Feistel network |
| Rounds: | 6 (128- and 192-bit key) or 8 (256-bit key) |
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.