Design And Implementation Of Validating Digital Certificate System

Human beings have entered into the information era with the development of computer and network technologies; thus, the security problem of information has become the fundamental mater. The modern cryptography is the kernel technique of information security. The digital certificate depend on digital signature is one of main researches in modern cryptography, and it cannot be substituted by other techniques in information security, including authentication data integrity, and non-repudiation. Digital certificate have many applications in military, electronic commerce and electronic government, etc.Digital certificate is used for validating identity of net users, protecting validity and integrality of transferred messages. It is a important composing of the PKIX. Translate the digital certificate with the third sides provided software is very riskful, and it cannot translate the certificate completely. So it is very important for studying the validation of digital certificate and protecting message transfers.This paper has analyzed the PKIX (Public Key Infrastructure based on X.509 standard) digital certificate validation mechanism, and has discussed the format of digital certificate, certificate syntax and encoding. It also has discussed the decoding and validating method provides by Microsoft Corporation and has realized decoding and validation of certificate by my own method using C language. In the end, this paper has discussed ASN.1, HASH algorithm and signature algorithm, the application prospect of PKIX and gives some suggestions for further development in the future.In the process of implementation of Validating Digital Certificate System, I have distill the N and E which are the public key's parameters. Its can be conveniently used for next step of the certificate.The safe of information is determined the safe of a country. Study on the infomation safety and make all the software loclized is the trend of research of infomation safety.