| With the development of information-based, information security has attracted people's attention. PKI (foundation facility of public key), as the basic information security, plays an important role in different information areas gradually. Moreover, many scientific institutions are doing the research on PKI application. In terms of PKI application on network security, this article carried out research and design, and addressed some new issues.In respect of PKI application, this article focuses on network security product VPN. The article is divided into six chapters to represent the PKI application respectively, PKI development, PKI status of the national and international, relative basic knowledge of information security-cryptology which includes symmetrical cryptology, public key cryptology, hash function, digital signature etc. The article mainly introduces the basic theory of PKI. Integrating the previous relative protocol and theory, it discusses the design and implement of IPSec VPN product with PKI, this content are regarded as an important section to narrate. Finally, the article makes a summary and prospects, meanwhile discuss the PKI future on VPN product design. |