摘要
针对传统分组加密算法仅仅依赖于算法设计 ,初始密钥始终不变的不足 ,提出利用Logistic映射改进分组密码算法的思想 .实现了基于混沌序列的DES算法 ,先用Logistic映射定时迭代产生的伪随机序列 ,然后经过变换后作为DES算法的密钥 ,使其分组加密算法得密钥也处于不断的变化之中 ,从而提高加密强度 .并给出了改进算法加密图像数据的应用实例 ,分析比较了改进后的算法和传统分组密码算法在安全性和抗破译性方面的性能 .
Traditional block encryption algorithm depends only on algorithm design and keep s the initial password fixed. To counter this deficiency an improved version of block encryption algorithms based on the Logistic-map chaotic sequences is pres ented and corresponding data encryption standard (DES) algorithms based on chaos is realized. Firstly, pseudo-random sequence produce by Logistic-map timely i s created. Then after transforming, it is used as the key of DES algorithm, whic h makes the block encryption algorithms’ key change from time to time and there fore improves the encryption intensity. An application example is given. Finally the security performance and anti-attack performance from both traditional blo ck encryption algorithm and improved algorithm are analyzed and compared.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第B11期11-14,共4页
Journal of Southeast University：Natural Science Edition
基金
江苏省"青蓝工程"计划资助项目 (JS2 0 0 40 7)
江苏省自然科学基金资助项目 (BK2 0 0 112 2 ) .
关键词
混沌
分组密码算法
加密
密钥
chaos
block encryption ciphers
encryption
key
