This article systematically discussed two kinds of encryption technology: Symmetrical expression encryption,public key encryption,as well as three encryption ways in network: link encryption,pitch point encryption and end-to-end encryption.

• 该文系统地讨论了两种加密技术:对称式加密、公开密钥加密,并探讨了网络中的三种加密方式:链路加密、节点加密和端到端加密。