图像加密可以保证网络安全传输,而传统加密方法缺乏扩教整个图像空间,造成效果差.为解决上述问题,提出一种小波变换的低频系数置乱和空域象素值替代相结合的混合图像加解密算法,结合了变换域和空域加密的特性.加密过程采用经典混沌模型生成密钥流矩阵,设计两种基于异或与模运算的可逆变换用于置乱与替代操作,使得加密流程清晰易操作,同时采用模块化思想,并行加密,提高了加密效率.通过仿真,将加密算法应用于彩色图像,获得了理想的加密效果,并可以满足图像信息安全传输对加密算法所要求的密钥空间大,具有强的抵抗统计分析和恶意攻击的能力,可以保证图像数据的无隐患传输.%Image encryption can ensure the safe transmission of image data in the network. In this paper, an im-age encryption and decryption algorithm was presented based on scrambling of low-frequency coefficient matrix of wavelet domain and pixels alternative on airspace domain. It was combined with the characteristics of transform do-main and the airspace encrypted scheme. During encryption process, two kinds of classical chaotic models were used to generate the matrix of key flow and desig two kinds of reversible transforms based on XOR and mod to do scramb-ling and replacing operation. It makes the encryption process clear and operation easier, at the same time, improves the efficiency of encryption by using the modular thought and parallel encryption. Through the simulation test, the en-cryption algorithm was applied in color images, and attained ideal effect of encryption. Finally, the analysis of en-cryption performance shows that it can meet the requirements of the image information security transfer for encryption algorithm, including (he factors such as bigger key space, capacity of strong resistance statistical analysis and mali-cious attacks and so on. These capacity can ensure the transmission of image data without hidden dangers.
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