摘要
针对计算机有限数字精度的限制导致混沌序列将退化为周期序列的缺陷,提出一种参数扰动下混沌的图像加密方案。首先,对已有的一个离散混沌系统进行了改进,得到了一个新的混沌系统。其次,将已有混沌系统的状态变量作为参数扰动,来扰动新构造的混沌系统以生成参数扰动下的混沌系统。在加密方案中,利用密文反馈的方式来控制迭代次数,动态产生密钥流。实验结果和安全性分析表明,该算法具有对密钥敏感、密钥空间大、密文图像统计特性良好、密文对明文敏感、能抵抗选择明(密)文的攻击等优点。
Due to the limitation of the numerical accuracy of the computer,the chaotic sequence will degenerate into the periodic sequence.An image encryption scheme based on chaotic system with parameter perturbation was proposed.Firstly,an existing chaotic system was improved to obtain a new chaotic system.Secondly,the new chaotic system was perturbed by the state variables of the existing chaotic systems,so that Chaotic system with parameter perturbation can be produced.In the encryption scheme,the number of iterations is controlled by the feedback of the cipher text and the key stream is generated dynamically.Experimental results and security analysis show that the algorithm is sensitive to the key and has a large key space,the encrypted image has good statistical properties and the encrypted image is very sensitive to the plain image,and the algorithm can resist the attack of choosing plain or cipher text.
出处
《计算机科学》
CSCD
北大核心
2017年第S1期356-360,384,共6页
Computer Science
基金
国家自然科学基金面上项目(61573178)
聊城大学自然科学基金(318011606)资助
关键词
Marotto定理
混沌加密
参数扰动
密文反馈
Marotto theorem
Chaotic encryption
Parameter perturbation
Cipher text feedback
