基于耦合混沌系统和细胞自动机的图像加密算法  

Couple chaos system and cellular automata based image encryption algorithm

作　　者：彭川[1,2] 李元香[1] 

机构地区：[1]武汉大学软件工程国家重点实验室,武汉430072 [2]中南民族大学计算中心,武汉430074

出　　处：《计算机应用研究》2012年第6期2218-2220,2239,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(61070009;60873114);中南民族大学中央高校科研业务专项资金资助项目(CZQ11006)

摘　　要：提出一种基于耦合混沌系统和细胞自动机的加密方法。耦合混沌系统比单一混沌系统具有更复杂的动力学特性,可以增大密钥空间,提高加密系统的安全性;利用耦合触发细胞自动机实现明文分块的并行加密,提高加/解密速度,改进置乱效果。加密时首先经过混沌加密,然后利用混沌序列产生反转规则,由细胞自动机再次加密;解密过程正好相反。实验表明,这种混合加密方法具有更大的密钥空间和更好的置乱效果,能够有效抵抗蛮力攻击和差分分析攻击。This paper proposed a new kind of data encryption method based on couple chaos system and couple CTCA.Couple chaos system had more better encryption performance because of its much larger key space and chaotic characteristic.CTCA was used by way that plain data was divided into two parts and encrypted by two TCA systems respectively,which could improve the encryption efficiency and expand key space.After encrypted by chaos system,encrypted the original data by CTCA again.Experiments show that this method has a large key space and good scrambling effect and the cryptosystem can resist brute attack and differential attack effectively.

关 键 词：耦合混沌系统 密钥空间 耦合触发细胞自动机 置乱效果 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]