Abstract:

Concerning the degeneracy of the computer limited precision effect in a single onedimensional discrete chaotic system, this article proposed a method of pseudorandom sequence generation with variable parameters in the process of the generation of the chaotic signal. The constructed chaos system based on this method had some advantages, such as the long cycle of pseudo-random sequence, the large quantity of key and the big superiority of key space, and the prodeced password has a higher safety performance. Besides, based on the method, a new image encryption algorithm was put forward. The simulation results show that this algorithm is simple, safe and easy to meet the software and hardware requirements.

摘要：

针对一维离散单混沌系统在计算机有限精度下存在的退化问题，提出了一种在生成混沌信号的过程中参数随机变化的混沌伪随机序列产生方法，基于该方法构建的混沌系统较单混沌系统具有伪随机序列周期大、密钥数量多、密钥空间大等优势，所产生的密码具有更高的安全性能。基于该方法，还提出了一种新的图像加密算法。仿真分析证明，该图像加密算法原理简单,安全性高,便于软硬件实现。

关键词: 伪随机序列;图像加密;混沌系统;参数随机变化