| 摘要 |
PURPOSE: An off-line electronic transaction system is provided to trace a duplicate user utilizing a bank device, assure anonymity and privacy of a legal user device, and enable the bank device to perform a conditional trace by a certificate office device. CONSTITUTION: The system comprises a user device connected to the system to perform electronic commercial transaction, a certificate office device issuing an anonymous certificate to an open key transmitted from the user device, a shop device counting a sole challenger value and supplying user-required product or service to the user device, and a bank device issuing electronic money and increasing the same money as the electronic money in an account of the shop device by receiving the electronic money from the shop device.
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