On the Security of the 128-bit Block Cipher DEAL
DEAL is a DES-based block cipher proposed by Knudsen. The block size of DEAL is 128 bits, twice as much as the DES block size. The main result of the current paper is a certificational attack on DEAL- 192, the DEAL variant with a 192-bit key. The attack allows a trade-off between the number of plaintext/ciphertext pairs and the time for the attacker,’s computations. Nevertheless, the DEAL design principle seems to be a useful way of doubling the block size of a given block cipher.
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