中文摘要：

目前国际上关于光学加密的绝大多数研究都属于对称密钥系统，这种系统由于在网络环境下的密钥管理、分发、传输问题尚未得到解决，所以无法与信息安全领域的国际标准相结合，从而不能嵌入到公钥基础设施（PKI）中。基于密码学的公钥技术提出了一种混合密钥加密系统，并加入认证技术，从而构建了一个网络环境下的虚拟光学信息安全系统模型。将新发展的虚拟光学加密算法与公钥系统的概念以及网络安全技术结合，有效地解决上述问题，为虚拟光学加密方法在网络安全中的应用开辟一条途径。

英文摘要：

Most reported researches on optical encryption techniques belong to symmetric cipher techniques from the point of view of cryptography. In such cryptosystems, the issues of reliable key management, key delivery, and key distribution still remain to be solved. It can be difficult for current optical encryption techniques to incorporate with international standard or protocol for the information security, so that it could not be appropriately applied for practical secure communications. A model of hybrid cryptosystem was proposed with the aid of public key techniques. Through this model, the solution of aforementioned issues may be found, The objective is to find out a way to combine both advantages of virtual-optics encryption algorithm and the concepts and techniques of public key infrastructure （PKI）. This approach paves a way for the realization of virtual-optics -based methodology under the environment of network security.