Method for creating, registering, revoking authentication information and server using the same

A server for creating and registering authentication information, comprising:

• a processor for determining whether or not a specific user's public key is registered if (i) the specific user's public key and (ii) a hash value of the specific user's information or its processed value are acquired from a biometric authentication server which received a request for registration of authentication information;
• and
• a communication part for creating and transmitting to a database a transaction whose outputs include (i) the specific user's public key and (ii) the hash value or its processed value if the specific user's public key is determined to be unregistered, acquiring a transaction ID representing location information indicating where the transaction is stored in the database, and delivering to the biometric authentication server a message notifying a successful registration of (i) the specific user's public key and (ii) the hash value or its processed value.

A server for revoking authentication information, comprising:

• a processor for determining whether or not a specific user's public key is registered if the specific user's public key is acquired from a biometric authentication server which received a request for revocation of authentication information;
• and
• a communication part for acquiring from a database outputs of a specific transaction corresponding to a transaction ID by referring to the transaction ID corresponding to the specific user's public key if the specific user's public key is determined to be registered, creating and transmitting to the database a new transaction which has at least part of the outputs as its inputs, acquiring a transaction ID representing location information indicating where the new transaction is stored in the database, and notifying the biometric authentication server of the revocation of the authentication information.