一种多混沌的彩色图像认证加密算法  

A Color Image Authentication Encryption Algorithm Based Multi-chaos

作　　者：蒲昌玖[1] 

机构地区：[1]重庆第二师范学院网络中心,重庆400067

出　　处：《科学技术与工程》2013年第20期5843-5847,共5页Science Technology and Engineering

基　　金：重庆市科委自然科学基金(CSTC;2010BB2279);重庆市教委科学技术研究项目(kj091502);重庆教育学院项目(KY201175C)资助

摘　　要：为了实现对彩色图像的有效保护,提出一种基于多混沌系统和图像认证功能的彩色图像加密算法。该算法通过对彩色图像RGB分量的运算生成128位Hash值,并把该Hash值作为部分图像加密的密钥。然后通过Logistic混沌系统、统一混沌系统和Hash值对彩色图像进行像素置乱和替代操作以实现图像加密。最后,理论分析和仿真实验结果表明,该加密算法具有密钥空间大,保密性好,加密图像像素值具有类随机均匀分布特性和相邻像素值的零相关特性。In order to protect color image effectively, a color image encryption scheme based on multiple chaotic maps and authentication is presented. The algorithm generated 128-bit Hash keys by the mathematical operation in the RGB components of the color image, and the Hash key is used as part of the image encryption keys. Then, pixels shuffling and Pixels substitution are simultaneous implemented to encrypt the color image using Logistic chaotic system、 unified chaotic system and Hash keys. Finally, theoretical analyses and simulated experiment show that the color image encryption algorithm shows advantages of larger key space, higher security, a random distribution characteristics of the pixel value of the encrypted image and the zero correlation of adjacent pixels.

关 键 词：哈希函数 多混沌 彩色图像 相关性 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]