摘要： 现有的图像加密算法对选择明文攻击安全性较低。针对该问题，提出一种基于自适应参数的图像加密算法，对图像重心公式进行改进，将计算所得的重心坐标作为自适应参数，协同用户密钥输入四维超混沌系统产生混沌序列，进行图像加密，通过可逆数字水印技术将自适应参数保存到加密图像中。实验结果证明，该算法密钥管理方便，能够抵抗选择明文等攻击。

关键词: 混沌序列, 图像加密, 图像解密, 选择明文攻击, 自适应参数

Abstract: Current image encryption algorithms are not resistant to plaintext-chosen attack. In order to solve the question, a new image encryption algorithm based on adaptive parameters is proposed. The improved image barycentric coordinates are chosen as adaptive parameters. The adaptive parameters and user keys are input into four-dimensional hyperchaotic system to generate chaotic sequences to encrypt image. And the adaptive parameters are saved into encrypted image by reversible watermarking technology. Experimental results show that the algorithm is expediently to manage keys and can resist some attacks such as chosen-plaintext attack.

Key words: chaotic sequence, image encryption, image decryption, chosen-plaintext attack, adaptive parameter

中图分类号: 

• TP301.6