为进一步提高密码芯片的安全性，密码芯片必须防止简单能量分析和差分能量分析的攻击。
To be more secure, crypto-chips should be protected against simple power analysis attack and differential power analysis attack.
SPN结构是一种流行的分组密码总体结构；差分和线性分析是攻击分组密码的最强有力的方法。
SPN is a popular overall structure of block cipher, and the differential cryptanalysis and linear cryptanalysis are the most powerful approaches to attack most symmetric block ciphers.
给出了差分序列的若干性质，对差分分析方法在序列密码中的应用作了一些探讨，并给出了攻击实例。
In this paper, we point out some properties of the differential sequence, discuss the applications of differential cryptanalysis in sequence cipher attack and provide an attack sample.
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