关键词: 掺铒光纤激光器, 双延迟变形系统, 超混沌, 图像加密

Abstract:

To resolve the problem of typical characteristics of hyperchaos sequence with weak pseudo random, an algorithm based on double-delay reforming system is proposed. The sequence which produced by double\|delay reforming system has larger Lyapunov exponent and better paseudo\|random characteristics than that of the previous   hyperchaos system. Without other combined pseudorandom sequences, only one total round of substitution and diffusion can meet good effect. Simulation result shows that the suggested algorithm satisfies the required performance tests such as high level security, large key space and acceptable encryption speed.

Key words: erbium-doped fiber laser, double-delay reforming system, hyperchaos, image encryption