Attacking Triple Encryption

. The standard technique to attack triple encryption is themeet-in-the-middle attack. In this paper, more efficient attacks are presented.Compared to meet-in-the-middle, our attacks either greatly reducethe number of single encryptions to be done, or somewhat reducethe overall number of steps. Especially, about 2108steps of computationare sufficient to break three-key triple DES. If one concentrates on thenumber of single DES operations and assumes the other operations to bemuch...