基于JPEG2000的图像联合压缩加密算法  

Image joint compression encryption algorithm based on JPEG2000

作　　者：谢凯明[1] 邓家先[1] 陈益刚[1] 

机构地区：[1]海南大学信息科学技术学院,海口570228

出　　处：《计算机应用研究》2014年第12期3695-3699,共5页Application Research of Computers

基　　金：海南省自然科学基金资助项目(613155);海南省普通高等学校研究生创新科研项目(S201315)

摘　　要：为实现图像的压缩和加密同步,在深入研究MQ算术编码器的基础上,将Lorenz混沌系统生成的随机序列作为流密钥对JPEG2000压缩算法中比特平面编码形成的上下文和判决进行修正,以改变MQ编码时的概率分布来使得输出的码流发生变化,从而实现图像联合压缩加密。阐述了上下文修正和判决修正加密算法的规则。对算法进行仿真,结果表明,相对于原始压缩算法,所提出的算法对图像的压缩效率几乎没有影响,且安全性好、实时性高。To synchronize image compression and encryption,on the basis of further research of MQ arithmetic encoder,this paper regarded the random sequence generated by Lorenz chaos system as flow key to modify context and decision which came into being in the process of bit plane coding of JPEG2000 compression algorithm. It changed the probability distribution of decision when MQ coding,which changed the output stream,and realized the image joint compression encryption in this way. It elaborated the rule of the context modification and the decision modification algorithm. The simulation results indicate that the proposed algorithm doesn’t influence the compression efficiency compared with the original compression algorithm. What’s more,it has high security and instantaneity.

关 键 词：压缩加密 算术加密 混沌加密 上下文修正 判决修正 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术] TN911.73[自动化与计算机技术—计算机科学与技术]