This essay is a study to find out any problems on validity of Certificate occurring in the course of On-Line transaction. For the present, our local body of Certification is using the standard of CRL(Certificate Revocation List) and OCSP(Online Certificate Status Protocol). According to standard note of IETF, they are now forwarding a scheme to use the standard of SCVP(Simple Certificate Validation Protocol) and OCSP in the future. At this point of time, I studied on several problems on validity of Certificate. In conclusion I examined the technical contents of SCVP and OCSP to solve those problems, and presented the direction of study for the future.
Abstract<BR>1. 서론<BR>2. 인증서 및 인증서의 유효성<BR>3. IETF에서의 표준안<BR>4. 인증시스템의 문제점<BR>5. 결론<BR>6. 참고문헌<BR>
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