Differential cryptanalysis of the ICE encryption algorithm

Abstract. ICE is a 64-bit block cipher presented at the Fast Softwar

Differential Cryptanalysis of the ICE Encryption Algorithm

ICE is a 64-bit block cipher presented at the Fast Software Encryption Workshop in January 1997. It introduced the concept of a keyed permutation to improve the resistance against differential and linear cryptanalysis. In this paper we will show however that we can use low Hamming weighted differences to perform a practical, key dependent, differential attack on ICE. The main conclusion is that the keyed permutation is not as effective as it was conjectured to be.status: publishe