实现十进制负数求二进制的补码，方便广大学者实现视频或图像加解密过程中用到异或加密-Seeking to achieve a negative decimal binary complement, facilitate the realization of the majority of scholars, video or images used in encryption and decryption process XOR encryption

Logistic映射，图像信号加密和解密，异或算法进行-Logistic mapping, image signal encryption and decryption algorithms XOR