基于Logistic混沌映射的图像加密系统及FPGA实现

混沌序列用于扩频通信系统,具有码元丰富、保密性好的优点。理论分析了Logistic混沌系统的定义、敏感性、李雅普诺夫指数以及相关性之后,采用Logistic混沌序列进行图像加密,并通过仿真和FPGA硬件实现验证了算法的可行性。结果表明该加密系统抗攻击性强,并且能够无失真的恢复原始图像。此外,本文提出的FPGA硬件实现系统具有体积小、功耗低、图像保密性好的特性。

Image Encryption System Based on Logistic Chaotic Map and the Implementation Using FPGA

Chaotic sequence is used in spread spectrum communication system, and has the advanta-ges of secure and diverse in form.After analyzing the definition of Logistic chaotic system, sensitivity, Lya-punov exponent and correlation properties, logistic chaotic sequence is used for image encryption, and the feasibility of the algorithm is verified by simulation and FPGA hardware implementation.The simulation re-sults show that the encryption system has good resistance to attack and it can fully recover the original image with correct keys.Besides, the FPGA hardware implementation system has characteristics of small volume, low power consumption and good image security.