It is necessary to the occasion where electronic signature communication and cryptocommunication are done making use of the authentication system access device and open key proof proof acquisition manner and open key proof proof nullfication verification manner and the storage and stores the release key proof proof acquisition program storage and stores the release key proof proof nullfication verification program storage null public key encryption which stores the authentication system access program and the release key proof proof

摘要

PROBLEM TO BE SOLVED: To realize processing for obtaining a public key certificate and confirming its invalidation without considering a system for obtaining the public key certificate in accordance with the administration policy of an issuer and differences in a system confirming invalidation, in the environment where users coexist who have had their public key certificates issued from a plurality of verification offices differing in administration policy.;SOLUTION: According to this invention, a system for obtaining the public key certificate and confirming its invalidation is dynamically determined according to the name of an issuer verification office of the public key certificate to be processed, by preparing a table defining the system for obtaining the public key certificate and the system for confirming its invalidation usable for each issuer authentication office of the public key certificate, and referring to the table when obtaining the public key certificate and confirming its invalidation.;COPYRIGHT: (C)2002,JPO