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发明授权
CN1829142B 一种强化密钥流序列的方法 失效 - 权利终止

一种强化密钥流序列的方法
摘要：
本发明涉及一种强化密钥流序列的方法，可增强序列的抗分析能力。输入字节序列x＝(x0，x1，x2，......)，输出经扰乱后的字节序列zi。包括：预置2m个记忆单元0，1，2，......2m-1，每个记忆单元中存放一个字节内容；对输入字节序列的每个字节xi做如下操作：取xi的高m比特的值为h；用第h个记忆单元中的内容yh与xi作异或操作，输出zi，即更新记忆单元，取出第h个记忆单元中的内容yh的低m比特的值t，将第h个记忆单元中的内容yh更新为将第t个记忆单元中的内容yt更新为其中S为一个非线性函数变换，是一个从字节到字节的置换，变换的输入输出均为8比特字符，S(yt)、S(xi)分别是以yt、xi为输入，计算S的函数值。
摘要（英）：

The present invention relates to a single byte operation based on sequence disturbing method having memory characteristic, capable of enhancing sequential anti analysis capability, inputting bytes sequence x =(x 0 , x 1 , 2 , ......), outputting disturbed bytes sequence zizith contains to preset memory unit, each memory unit storing a bytes content, doing as follows operation to inputted bytes sequential each bytes xi, taking xi high bit value as h, using h memory unit content yh and xi doing XOR operation, outputting zi, i.e. zi = yh xi, updating memory unit, taking out low m bit value of h memory unit content yh, updating memory unit content yh to yh s (yt), updating t memory unit content yt to yt s (xi), wherein s being a nonliner function conversion conversion input/output all being 8bit character, s (yt), s (xi) respectively using yt, xi as input, calculating s functional value.

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