一种基于分段线性映射的分组密码算法  

Block Cryptosystem Based on Piecewise Linear Map

作　　者：马洁[1] 张元清[2] 

机构地区：[1]重庆教育学院美术系,重庆400067 [2]重庆教育学院计现系,重庆400067

出　　处：《计算机科学》2009年第9期103-105,172,共4页Computer Science

摘　　要：提出了一种新的基于混沌理论的分组密码算法,把128比特的明文加密为128比特的密文。整个加密过程包含了8个轮变换,每一个轮变换由替换变换、移位变换和置换变换3部分组成。所有的轮密钥都由128位的比特流K和由分段线性映射产生的128比特随机二进制序列导出。理论与实验分析表明该算法克服了一些纯混沌密码系统的固有缺陷,具有较高的性能。Based on the study of some existing chaotic encryption algorithms, a new block cipher was proposed. The proposed cipher encrypts 128-bit plaintext to 128-bit ciphertext blocks. It consists of eight computationally identical rounds transformation. All roundkeys are derived from K and a 128-bit pseudorandom binary sequence generated from a chaotic map. Analysis shows that the proposed block cipher does not suffer from the flaws of pure chaotic cryptosysterns and possesses high security.

关 键 词：分组密码 混沌映射 模乘运算 置换 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]