APPARATUS AND METHOD FOR GENERATING AND VERIFYING ID-BASED BLIND SIGNATURE BY USING BILINEAR PARINGS

PURPOSE: An apparatus and method for generating and verifying ID-based blind signature by using bilinear parings are provided to reduce the calculation time and the storage space as well as to simplify the process of key management system. CONSTITUTION: An apparatus and method for generating and verifying ID-based blind signature by using bilinear parings includes the steps of: creating(201) a system parameter and selecting a master key; generating(202) a public key and a secret key by using a personal identity information of signer; publishing(203) a public value including the system parameter and the public key of the signer and transmitting the secret key of the signer through a safe channel; receiving(204) and storing the public value and receiving and storing the public value and the secret valued of the signer; calculating(205) the consigned value and transmitting the calculated value to the user; transmitting(206) the blind message to the signer by the user; transmitting(207) the signed message to the user by the signer; recovering(208) the blind message by the user; and authenticating(209) the signature by the user.