基于变周期型伪随机序列的一种改进思想

m序列是序列密码的核心内容,可以生产具有良好密码学特性的伪随机码,原理明确,实现方法简单。但常规型m序列,由于线性复杂性较低,容易由B-M等算法推出极小多项式,最终破译。主要引入变周期型m序列的思想,使这种m序列有多个极小多项式,其周期可不断地变化,有效地抵抗各种常规攻击方式。

A Kind Of Improvement Of Pseudo-Random Sequence Based On Variational Period

AM sequence is a key content of the password of the sequence. It can produce pseudo-random sequence with good characteristic of cryptography.The principle is clear and the method of implementation is very simple.But the linear complexity is relatively low and easy to calculate the little multinomial by B-M algorithm and decodes finally.This article includes the thought of variational period,makes pseudo-random sequence having several little multinomials and its period constantly changes.This method is effective to resist various kinds of routine attack.