一种新的图像加密融合算法仿真研究  

Simulation Research on Novel Image Encryption Merging Algorithm

作　　者：张牧[1] 濮存来[2] 

机构地区：[1]成都体育学院信息技术中心,四川成都610041 [2]南京理工大学计算机科学与工程学院,江苏南京210094

出　　处：《计算机仿真》2014年第4期402-406,共5页Computer Simulation

基　　金：国家自然科学基金项目(61001195)

摘　　要：在当前的图像加密研究领域中,主要是采用了低维混沌系统,而系统存在密钥空间小、安全性低的缺点,无法有效地抵御各种攻击。为此提出一种新的基于超混沌Chen系统与CAT映射相融合的图像加密算法,将与明文图像相联系的密钥流形成机制考虑进来,使密钥流同时与初始图像及密钥相关。首先采用广义离散的CAT映射改变图像中像素点的位置;然后采用超混沌Chen系统改变置乱后的图像中任意点的像素值;并利用密钥流形成机制产生的密钥元素对明文图像加密处理。最后借助Matlab仿真软件验证了上述算法,结果显示,改进加密算法具有较好的加密性能,密钥空间得到了显著提高,抗攻击能力大幅度提升。Recently, low dimensional chaotic system is regarded as a popular technique in image encryption re search filed. However, this system can not defense attacks effectively due to the weaknesses such as small key space as well as low level security. In this paper, we proposed a novel image encryption algorithm based on hyper cha otic Chen system merged with CAT map, which takes key stream related with plain image into consideration so that connection is made during key stream, initial image and key. First, the position of each pixel in image was changed by discrete CAT map. Then, the hyper chaotic system was used to change the pixel value. Next, a plain image was encrypted by key from key stream. We realized the algorithm with Matlab. The experiments demonstrate that our method has high performance in encryption, and is able to improve key space significantly and the ability of anti plaintext attack.

关 键 词：加密算法 密钥匙流机制 超混沌系统 抗攻击 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]