基于信息隐藏的混沌JPEG图像加密算法

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.

Chaotic Image Encryption Algorithm Based on Information Hiding

A chaotic image encryption algorithm based on information hiding is proposed by combining 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 procedure. Hence, the encryption algorithm is resistant to both chosen plain text attack and chosen cipher text attack. In addition, the random number used in encryption is embedded in the image by information hiding technique, so that receivers do not need a related random number generator to recover the key. Experimental results show that the algorithm is more secure.