基于穷尽熵优化的混沌图像加密  

An Exhaustive Entropy Optimization-based Chaotic Image Cryptography

作　　者：宁磊[1] 王振永[1] 杨明川[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,哈尔滨黑龙江150001

出　　处：《通信技术》2011年第10期68-70,共3页Communications Technology

摘　　要：图像加密要求选择随机性强的密钥,基于混沌密码学的密钥生成算法具有广阔的密钥空间。然而并不是空间中所有的密钥都具有很强的随机性。故提出一种基于穷尽熵的混沌图像加密方案。利用Lorenz混沌系统产生混沌信号,对其分组二值量化后选择熵较大的一组对图像进行加密和解密处理。同时,通过对加密图像的安全性分析,结果表明所提出的方案具有比传统混沌图像加密更高的鲁棒性。The key in strong randomness is needed in image encryption.The key generation algorithm based on chaotic cryptography has a large key space,and however,not all keys in the space are of strong randomness.This paper presents a chaotic image cryptography based on exhaustive entropy.The chaotic signal is generated by Lorenz system,and with binary quantization in group,the only one group with larger entropy is selected for image encryption and decryption processing.Meanwhile,the analysis on encrypted image security shows that the proposed image encryption scheme is of higher robustness than the traditional chaotic image encryption scheme.

关 键 词：洛伦兹系统 图像加密 穷尽熵 混沌密码学 

分 类 号：TN87[电子电信—信息与通信工程]