中文摘要：

近年来,混沌作为非线性系统中一种新的存在形式被广泛和深入地研究.随着计算机科学和信息技术的发展,密码技术的发展非常迅速.混沌系统对初始条件和系统参数的敏感依赖性、非周期性和遍历特性等,使其具有优良的密码学特性.本文在分析Enigma加密机制的基础上,将非线性混沌过程融入到Enigma加密过程中,设计了一种结合混沌映射的Enigma加密方案.该加密方案有效地利用了Enigma原有的近似非线性的加密机制,利用混沌过程,加强了置换的随机性,提高了加密方案的安全性.对图像及文字进行加密实验结果表明,本加密方案在密钥敏感性分析、相邻像素相关性以及差分攻击分析等方面,都有很好的表现.

英文摘要：

In recent years,chaos as a new form of the nonlinear science has been widely and deeply studied.With the development of computer and information science,encryption technology is developing very rapidly.In this paper,on the basis of analyzing the principle of Enigma,a novel encryption scheme with chaotic process is introduced.The encryption scheme takes advantage of the approximate non-linear mechanism of original Enigma,with the chaos controlling the encryption process,it has strengthened the randomness of plaintext replacement and improved the security of the encryption scheme.The results of encrypting images and letters evidence that the novel encryption scheme shows good performances in the analysis of key sensitivity﹑related coefficient between adjacent pixels and differential cryptanalysis.