method of implementing use of electronic cash

专利名称：method of implementing use of electronic

cash

发明人：Okamoto, Tatsuaki,Ohta, Kazuo申请号：EP92109934.7申请日：19920612公开号：EP0518365A2公开日：19921216

专利附图：

摘要：In an electronic cash system, K sets of blind signature information are derivedfrom secret information containing identification information of a user (200, 400), K/2 setsof them are opened and a bank (100) attaches a blind signature to the remaining K/2 setsof information. The user obtains a signed license from the blind signature. The usergenerates blind signature information from the license and a desired amount of moneyand gets a blind signature of the bank to the blind signature information and obtains

electronic cash signed by the bank from the blind signature. The user presents to a shop(300) a residue power root of a node in a money hierarchial structure and the electroniccash, corresponding to the amount of money to be used, and the shop verifies theirvalidity and, if they are valid, offers inquiry information to the user. The user offers, asresponse information, a residue power root of the node corresponding to the amount ofmoney to be used to the shop. The shop verifies the validity of the response informationand, if it is valid, acknowledges the payment with electronic cash of the amount of moneyto be used.

申请人：NIPPON TELEGRAPH AND TELEPHONE CORPORATION

地址：19-2 Nishi-Shinjuku 3-chome Shinjuku-ku, Tokyo 163-19 JP

国籍：JP

代理机构：Hoffmann, Eckart, Dipl.-Ing.

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