ANONYMITY CERTIFICATE SYSTEM, ANONYMITY CERTIFICATE METHOD, USER APPARATUS, MANAGER APPARATUS, VERIFIER APPARATUS, APPARATUS FOR USER SPECIFYING PERSON IN CHARGE AND THOSE PROGRAMS

摘要

PROBLEM TO BE SOLVED: To provide an anonymity certificate technology including two functions: a function 1 by which a manager apparatus can freely deny an arbitrary user apparatus as a valid user apparatus in anonymity certificate independently from a process of anonymity certificate between the user apparatus and a verifier apparatus: and a function 2 by which an apparatus for user specifying person in charge can specify the user apparatus from data when performing verification.;SOLUTION: Function 1: While the manager apparatus holds voluntarily concealed information based on the difficulty of discrete logarithm matter by the secret key of the user apparatus as a blacklist, the verifier apparatus verifies formation of a relation based on the bilinear property of bilinear mapping between ad hoc information and blacklists created from certification information corresponding to user holding information for each anonymity certificate in performing anonymity certificate. Function 2; Information contained in the ad hoc information which the verifier apparatus has received, and information which leads to user specification using the secret key of the apparatus for user specifying person in charge are restored.;COPYRIGHT: (C)2009,JPO&INPIT