流密码与分组密码是基于位运算的图像加密算法中两种主要密码体制。

Stream cipher and block cipher are main cipher systems in image encryption algorithm based on bit operation.

youdao

一个自己设计的加密体制。本体制采用分组密码思想，对128位的明文分组进行加解密。

Block cipher used in this system of thought, of the 128-bit encryption and decryption expressly groups.

youdao