随着网上交易的数据安全，机密信息传输，个人账户和密码越来越得到人们的重视，网络安全已经成为网络传输中不可缺少的研究课题之一。在网络传输加解密和数据唯一性验证上，Netscape开发的安全套接层协议SSL是Internet上使用最为广泛的进行保密通信的安全协议。它通过在传输数据之前实现分层和握手机制,为TCP/IP连接提供机密性、完整性、不可否认性、服务器认证以及可选的客户端认证等安全服务。

在本文中，我们通过研究网络协议和SSL协议，分析其中的关键技术和难点，使用OPENSSL开源库来实现数据的加密传输工作。

With the increasingly importance paid to the data security of online transaction, transmission of confidential information, personal account and password, the network security has become one of a indispensable study subject in network transmission. As for the encryption and decryption of network transmission and the verification of data uniqueness, the Secure Sockets Layer protocol (SSL) developed by Netscape is used mostly to conduct confidential communication. It realizes layer and handshaking system prior to data transmission, to provide confidentiality, integrality, non-repudiation, server certification and optional client authentication, and other security services.
In this paper, through studying the network protocol and the SSL protocol, we analyize key technologies and difficulties among them and realize the encrypted transmitting of data by using open-source library.

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