GENERATION/RESTORATION METHOD OF IDENTIFIER FOR DISCLOSURE, REWRITING METHOD, INVALIDATION METHOD, IDENTITY CONFIRMATION METHOD AND ITS DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent a user identifier from being used for the usage unpredicted by a user. SOLUTION: In a generation/restoration method of an identifier for disclosure, an identifier for disclosure generation device 3 encrypts a mail address R of a recipient terminal 1 and additional information C by using a public key of a relay server 4A and generates a mail address T for disclosure (Step 13), notifies the address T to the terminal 1 (Step 14) and discloses the address T from the terminal 1 to an originator terminal 2 (Step 15). When an e-mail addressed to the address T is transmitted from the terminal 2 (Step 16), the e-mail is received by the relay server 4A via a relay server 4C (Step 17), the address T is decrypted by a private key and the address R of the terminal 1 and additional information C are restored (Step 18), and an e-mail addressed to the address R is transferred (Step 20). COPYRIGHT: (C)2005,JPO&NCIPI