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朱淑芹 李俊青 (聊城大学计算机学院 聊城252059)  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。 关键词 Marotto定理,混沌加密,参数扰动,密文反馈 中图法分类号 TP391 文献标识码 A  Image Encryption Scheme Based on Chaos with Parameter Perturbation ZHU Shu-qin LI Jun-qing (School of Computer Science,Liaocheng University,Liaocheng 252059,China)  Abstract Due to the limitation of the numerical accuracy of the computer,the chaotic sequence wil 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 controled by the feedback of the cipher text and the key stream is generated dynamicaly.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.

参数扰动下的混沌的图像加密方案 (Image Encryption Scheme Based on Chaos with Parameter Perturbation).