At first , double random phase encoding techniques are looked back and its improved methods are introduced in detail . in connection with characteristics of spherical wave gene and function of phase mask , one random phase encoding techniques are proposed with spherical wave based on 4f system 本文首先对双随机相位加密技术进行了回顾,并对它的一些改进方案的特点作了详细介绍,并在此基础上,根据球面波相位因子的特点和相位掩模在加解密中作用,提出了一种利用球面波照射4f系统的单随机相位编码加密的新方法。