一种具有伪密钥机制的图像加密算法

An image encryption algorithm with a pseudo-key mechanism

为了提高图像的安全性,提出了一种拥有伪密钥的图像加密算法.该加密算法基于Logistic混沌序列和置换矩阵,将一张假密图和一张真密图依次随机地嵌入到一张大图中,并结合置换矩阵进行加密.加密过程不会对真密图造成信息丢失.解密时根据密钥的不同可以解出一张假密图和一张真密图.同时,仿真结果表明,该加密算法具有抗差分攻击能力强及能够有效抵抗其他一般性攻击等优点.

In order to improve the image security,an image encryption algorithm with pseudo key was proposed.The encryption algorithm was based on Logistic chaotic sequence and permutation matrices.In the proposed algorithm,a false image and a true image were randomly embedded into a large image in order and encrypted with permutation matrices.The introduced encryption algorithm did not cause information loss to the true image.During the decryption process,a false image and a true image could be decoded according to the different key.At the same time,the advantages of strong resistance to differential attack and effective resistance to other attacks were observed in the simulation results.