| 摘要 |
PROBLEM TO BE SOLVED: To attain the exchange of the different kinds of electronic money while guaranteeing the safely of transaction and maintaining anonymity. SOLUTION: A user A transmits a sum W1 to be exchanged and user identification data XX1 to an exchange shop B (S2), and the shop B prepares an exchange condition and the signature, and transmits them to the user A (S3). Then, the user A verifies the signature (S5), and when the user A agrees with the exchange condition (S6), the user A transmits the W1 to the shop B by first currency units (S8). The shop B receives the W1 and transmits a receipt with the signature to the user A (S9). Then, the user A verifies the receipt (S11), transmits user certification information ZZ1 to the shop B (S14), and the shop B verifies the coincidence of the user identification data XX1 with the ZZ1 (S15), and when they are made coincident, the shop B transmits W2 to the user A by second current units (S16), and the user A transmits the receipt to the shop B (S17). |
