摘要
结合图像数据冗余性特点和图像压缩过程给出一种JPEG图像加密算法。在加密过程中:一方面结合压缩方法的特性,构造了加密算法,使得加密尽量不影响压缩;另一方面引入128bit的随机数,每次加密该随机数均不同。加密完成后,将该随机数嵌入到加密后图像的最低有效位后得到最终的密文图像。实验和分析表明该算法具有较好的安全性。此外,虽然加密过程导致图像DCT系数的损失,但并不影响解密后图像的视觉效果。
A chaotic image encryption algorithm based on information hiding is proposed by combi- ning the redundancy of image data and the idea of information hiding. The sub-key is generated by the user key and a 128bit random number, making the sub-key different for every encryption proce- dure. Hence, the encryption algorithm is resistant to both chosen plain-text attack and chosen ci- pher-text attack. In addition, the random number used in eneryption is embedded in the image by information hiding technique, so that receivers do not need a related random number generator to re- cover the key. Experimental results show that the algorithm is more secure.
出处
《信息工程大学学报》
2014年第2期148-155,共8页
Journal of Information Engineering University
关键词
四维混沌系统
图像加密
冗余性
4D chaotic system
image encryption
redundancy
