说明：  真随机数序列用于图像加解密系统中，作为密钥进行加密，使得图像加解密算法具有近似“一次一密”的安全性。
(The true random number sequence is used in the image encryption and decryption system as the key to encrypt the image The algorithm of image encryption and decryption has the security of "one encryption at a time")