How, electronic payment systems, computer programs, issuer, acceptor, validator, the emitter (how to check automatically validity transactions, electronic payment systems, and computer program)

摘要

PROBLEM TO BE SOLVED: To provide an improved secure and anonymous transaction system and transaction method.;SOLUTION: A validity checking method is provided for automatically checking validity of transaction among an issuer having signature keys pk_B, sk_B, an emitter having emitter keys pk_U, sk_U, an accepter having unique identity id_M and a limit N_M to transaction, and a validator. An electronic account settlement system 100 including a bank computer system 101, a user computer system 102, a store computer system 103 and a validator computer system 101, a computer program and a computer program product are further provided.;COPYRIGHT: (C)2008,JPO&INPIT