对多混沌映射图像加密算法的分析与改进  

Analysis and improvement for image encryption algorithm based on multiple chaotic mapping

作　　者：刘祝华[1] 袁文[1] 

机构地区：[1]江西师范大学物理与通信电子学院,江西南昌330022

出　　处：《计算机工程与设计》2014年第11期3723-3729,共7页Computer Engineering and Design

基　　金：国家自然科学基金项目(11264016);江西省教育厅科研基金项目(GJJ12172);江西师范大学科研基金项目(4554)

摘　　要：对一种多混沌映射图像加密算法进行分析,分析结果表明,该算法不能抵抗选择明文攻击和差分攻击,为此提出一种改进的自适应多混沌分块图像加密算法。将图像分成上下两块,使加密因子与明、密文相关联;改进加密公式,使密文与明文、密钥的关系复杂化。实验结果表明,改进算法的安全性高,克服了原算法不能抵抗选择明文攻击和差分攻击的缺陷,拥有更好的密文统计特性,且密钥空间巨大、加密速度快。An image eneryption algorithm based on the multiple chaotic mapping was analyzed. The results show that the algorithm fails to resist chosen plaintext attacks and differential attacks. For this reason, an improved blocking image eneryption algorithm based on the self-adaptive multiple chaotic mapping was proposed. The image was divided into the upper and lower blocks, making the encryption factor associate with the plaintext and the cipher-text. The encryption formula was improved which complicated the relationship between the cipher-text and the plaintext and keys. The experimental results indicate that the improved algorithm has high safety, overcomes the defects of the original algorithm, and has better statistical characteristics, huge key space and high encryption speed.

关 键 词：多混沌映射 图像加密 加密因子 选择明文攻击 差分攻击 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]