permutation operator meaning in English

置换算符
置换算子

To solve the problem of watermark encryption , a novel permutation operator is proposed , based on which the permutation scheme and the substitution scheme for watermark encryption are designed ; encryption algorithms in spatial domain and transform domain are proposed . the ciphered image can be jpeg compressed before it is transmitted , and low - distortion plain image can be obtained after decrypting the compressed encryption image
为解决水印信息加密问题,我们在第三章提出混沌有序化算子方法,设计了水印信息加密的置乱模块和替代模块;还给出了空间域和变换域数字图像加密算法,密文图像可以经过有损压缩再传输,经过解密得到低失真的明文图像。