Twofish算法中密钥相关S-盒的差分性质分析及其改进
Differential Analysis and Modification of the Key-Dependent S-Boxes of Twofish
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摘要: 该文从理论上证明了Twofish算法中,密钥越长,密钥相关S-盒的差分概率就越小,提出了一种新的与密钥作用的方式来产生密钥相关S-盒的方法,理论与测试结果表明新的S-盒的异或差分概率和模加差分概率比原算法的差分概率要小.
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关键词:
- Twofish;差分分析;S-盒
Abstract: This paper proves that the longer the key of Twofish is,the smaller the differ-ential probabilities of the key-dependent S-boxes are. A new method is proposed to produce the key-dependent S-boxes. Theory and simulation results show that the XOR differential probability and modular addition differential probability of the modified S-boxes are smaller than those of the original S-boxes. -
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