ANONYMOUS CERTIFICATE PROCESSING SYSTEM BY DISTRIBUTED AUTORITY

摘要

PURPOSE: An anonymous certificate processing system by distributed authority is provided to protect the privacy of a user by allowing a common name certification server and an anonymity certification server to confirms common name information when they are operated mutually. CONSTITUTION: A common name certification server(10) supply an one-time credit including a group key of a terminal of which a user is identified and a secret key which is allotted to the user from the group key. An anonymity certification server compares a part of a secret key which is obtained from a group signature which is handed out by the user with the one-time credit and authorizes the user, and then it issues a pseudonym certificates to the user.