钟控密钥流生成器及其密码性能  

On a clock-controlled keystream generator and its cryptographic properties

作　　者：马卫局[1] 冯登国[1] 

机构地区：[1]中国科学院研究生院信息安全国家重点实验室,北京100049

出　　处：《通信学报》2007年第7期42-47,共6页Journal on Communications

摘　　要：提出了一种新的钟控密钥流生成器,由3个移位寄存器组成:两个被钟控的线性反馈移位寄存器A和B,一个提供钟控信息的非线性反馈移位寄存器C。设A、B和C的长度分别为l1、l2和l3。移位寄存器A和B的钟控信息由从移位寄存器C选取的两个比特串提供,移位的次数分别是两个比特串的汉明重量。研究了该生成器的周期、线性复杂度和k错线性复杂度,分析了这种密钥流生成器的安全性。A new clock-controlled keystream generator was proposed, which was composed of three shift registers： two clock-controlled linear feedback shift registers A, B, and one clock-controlling nonlinear feedback shift register C. Let I1,I2 andI3 denote the length of A, B and C, respectively. The clock-control information is from two bit strings of feedback shift register C, and the limes A and B shift are according to the Hamming weights of the two strings, respectively, The period, the linear complexity and the k error linear complexity of the keystream generator are studied, and its security was analyzed.

关 键 词：密码学 密钥流生成器 钟控 安全性 

分 类 号：TN918.1[电子电信—通信与信息系统]