Twofish算法中密鑰相關S-盒的差分性質(zhì)分析及其改進
Differential Analysis and Modification of the Key-Dependent S-Boxes of Twofish
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摘要: 該文從理論上證明了Twofish算法中,密鑰越長,密鑰相關S-盒的差分概率就越小,提出了一種新的與密鑰作用的方式來產(chǎn)生密鑰相關S-盒的方法,理論與測試結(jié)果表明新的S-盒的異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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關鍵詞:
- 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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