基于实时应用的混沌加密方案设计

Design of Chaotic Encryption Scheme for Real-time Application

针对实时加密算法要求结构简单与非线性好的物理特性，本文采用随机反馈的伪随机序列生成器的方法，提出了基于改进Logistic映射的新混沌加密方案。所提方案的目标是使混沌加密设计能适合具有快速加密速度的实时性应用。由于改进Logistic映射与原Logistic映射相比具有分歧函数图的均匀性和避免短混沌路径，因而可使系统产生有更好的随机性行为。最后分别从速度、安全性和测试等方面评估了方案的性能。

This paper presents a new chaotic encryption scheme based on a modified logistic map using a pseudo-random sequence generator depending on random feedback techniques for its simple construct and non-linear dynamic. The intentions of the scheme are to make the design suitable for real-time application with fast encryption speed. The modified logistic map has better properties than the logistic map in terms of uniformity of bifurcation diagram and also avoids the short-length chaotic orbit, giving a more random behaviour to the system. Detailed discussions are given to estimate the performance of the scheme, respectively from the viewpoints of speed, security, realization and experiments.