Publication

Feistel ciphers with L2-decorrelation

Serge Vaudenay
1999
Conference paper
Abstract

Recently, we showed how to strengthen block ciphers by decorrelation techniques. In particular, we proposed two practical block ciphers, one based on the GF(2n)-arithmetics, the other based on the x mod p mod 2n primitive with a prime p=2n(1+d). We show how to achieve similar decorrelation with a prime p=2n(1-d). For this we have to change the choice of the norm in the decorrelation theory and replace the L8 norm by the L2 norm. We propose a new practical block cipher which is provably resistant against differential and linear cryptanalysis

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