Design Of Security Agent Based On SSL Protocol

With the development of computer network especially the Internet, the security of network receives more and more attention. The Internet is based on TCP/IP protocols, but TCP/IP protocols can't guarantee the security. To solve these problems, various solutions have been brought up. The secure transport of data has become the emphasis of network environment and one of those important factors of network development. SSL protocol is one of the most famous secure protocols.SSL protocol belongs to the session layer, and plays an important role in the Internet. Presently, many of the famous commercial products of browsers and web servers support SSL. SSL has become one of the most popular secure protocol.Many develops have released secure products based on SSL, but, most of the secure protocols are subject to the limitation of export regulations. Most of them adopt weak cryptography algorithms(with key of 56 bit downwards) and its source code isn't published. To satisfy the demands of the e-governmental affair, e-commerce and other affairs, we designed a SSL security agent.The main research work contains:Using OpenSSL development package implements a simple certificate authority, and use the OpenSSL command line interface to issue the certificate and corresponding private keyfile.This paper analyses SSL protocol in detail based on confidentiality, integrity and authentication. SSL security technology is proposed in the application on the Internet.With the knowledge of cryptography and the SSL protocol principle, I designed SSL security agent on fully guaranteeing the security, use vc6.0 and the OpenSSL toolkit to simulately implement the security agent. The main functions contain 1 It's able to establish a secure connection by SSL protocol.2 Make authentication in the communication through the technology of digital signatures and certificates.3 Secure communications, use reliable algorithms and proper length keys in the transmission to ensure the safety.4 The transmitted documents can be securely encrypted.