Abstract: A signature log storing apparatus includes a signature log list and a certificate list, and registers, in the signature log list, a part of signature information in generated hysteresis signature as a signature record and a part of a user certificate in the certificate list. The signature log storing apparatus further includes a trust point list and validates a signature records registered in the signature log list and registers identification information for identifying a latest signature record out of the validate signature record, evidence information for validating validity of the user certificate for a validated signature record, and a hash value of information derived by connecting the evidence information and the hash value as needed or before the user certificate expires.

Abstract: An authentication device 40 which is used for a thin client 30 or the like encrypts address information of the biological information management apparatus 10 that is an access destination of the thin client 30 with biological information of a user of the thin client 30, and stores the encrypted address information. When the authentication device 40 receives the biological information of the user of the thin client, the authentication device 40 decrypts the encrypted address information with the received biological information, and outputs the decrypted address information to the thin client 30. When the thin client 30 accesses a biological information management apparatus 10 by using the address information and succeeds in an authentication, the thin client 30 receives profile information of a server 20 from the biological information management apparatus 10. The thin client 30 then logs in the server 20 by using the profile information.

Abstract: A signature log storing apparatus includes a signature log list and a certificate list, and registers, in the signature log list, a part of signature information in generated hysteresis signature as a signature record and a part of a user certificate in the certificate list. The signature log storing apparatus further includes a trust point list and validates a signature records registered in the signature log list and registers identification information for identifying a latest signature record out of the validate signature record, evidence information for validating validity of the user certificate for a validated signature record, and a hash value of information derived by connecting the evidence information and the hash value as needed or before the user certificate expires.

Abstract: An authenticity assurance apparatus for e-mail documents which preserves a transmitted e-mail includes a unit to add a digital signature to an e-mail document and a file attached to it at time of transmitting the mail from a sender and from the apparatus; a unit to check for a mail tampering by using the digital signature at time of receiving the mail by the apparatus and by a recipient; a unit to inform the sender and the recipient of the tampering when detected; a unit to preserve the mail and the associated data on an unoverwritable database; a unit to meet a requirement of integrity by creating and adding a time stamp; a unit to encrypt and preserve the e-mail document and the attached file; and a unit to meet a requirement of confidentiality of the e-mail document by limiting an access to the database.