| 摘要 |
The invention provides a method for performing card authentication of a bank card. The method comprises reading a first liquid encoded number (LEN card) from a bank card; transmitting the LEN card to an authorisation server, the authorisation server interfaced to an authorisation database; retrieving at least a further liquid encoded number (LEN current) from the authorisation database; and comparing LEN card and LEN current. If the LEN card is not equal to the LEN current then if the bank card is a new card, the method includes processing the bank card as a new card otherwise processing the bank card as a fraudulent card. If the LEN card equals the LEN current, then the method includes generating a further liquid encoded number (LEN new); writing the LEN new to the bank card in place of the LEN card; and writing the LEN new to the authorisation database in place of the LEN current.
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