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演化密码是我国学者提出的一种新型密码体制.本文对演化密码对抗差分密码分析的能力进行了研究,研究表明演化密码对抗传统差分攻击的能力高于普通固定算法密码.本文在分析差分攻击的数据复杂度,最佳差分特征概率,比特优势以及预期成功率关系的基础上,证明了比特优势和预期成功率相同时,攻击演化密码的数据复杂度大于攻击固定算法密码的数据复杂度;并证明了在数据复杂度和预期成功率相同的情况下,攻击演化密码的时间复杂度明显高于攻击固定算法密码的时间复杂度.这表明演化密码对抗传统差分攻击的能力高于固定算法密码.
Evolutionary Cryptography is a new cryptosystem proposed by Chinese scholars.This paper studies the evolvement of cryptanalysis against differential cryptanalysis, and studies show that evolved cryptanalysis is superior to ordinary fixed cryptanalysis against traditional differential cryptanalysis.In this paper, Data complexity, best differential probability, bit advantage and expected success rate, it is proved that the data complexity of attack evolution cryptography is greater than the data complexity of attack fixed algorithm cryptography when the bit superiority and expected success rate are the same. It is proved that the time complexity of attack evolution cryptography is obviously higher than the attack cryptographic algorithm time complexity under the same data complexity and expected success rate.This shows that evolved cryptanalysis is superior to fixed algorithm cryptanalysis against traditional differential cryptanalysis.