摘要
分析了E.lvarez密码系统的加密方法及其弱点,在此基础上给出了一种基于遍历性的混沌加密新算法.即以混沌系统的控制参数和初始点为密钥,迭代混沌映射以便产生一个比特链,在该比特链中搜索明文分组,记下迭代次数作为密文分组.新算法避免了E.lvarez密码方案中的若干弱点,增强了密码系统的安全性.最后通过对Logistic映射的仿真研究,验证了新密码系统满足密码学中的混淆和散布特性,并进而阐明了新密码系统的有效性.
The encryption and weaknesses of the E.Alvarez cryptosystem are analyzed. A new chaotic cryptosystem based on ergodicity is proposed. The control parameters and initial condition of a chaotic system are selected as the secret key. A bit chain from the chaotic orbit is generated, and the position at which a plaintext block appears in the chain is found. Then record the number of iterations of the chaotic map as the cipher block. Several weaknesses of the E. Alvarez cryptosystem are voided in the new scheme. The security is strengthened. Finally the new cryptosystem is studied experimentally using a logistic map. It is shown that the new cryptosystem satisfies the confusion and diffuse characteristics. Effectiveness of the proposed scheme is demonstrated.
出处
《计算物理》
CSCD
北大核心
2006年第5期621-625,共5页
Chinese Journal of Computational Physics
基金
国家自然科学基金(批准号:60573172)
辽宁省教育厅高等学校科学技术研究计划(批准号:20040081)资助项目
关键词
遍历性
混沌
密码系统
密钥
比特链
有效性
ergodic
chaos
cryptosystem
secret key
bit chain
effectiveness
