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Consecutive numbering use required approval modulo null consecutive numbering of the reusable
Consecutive numbering use required approval modulo null consecutive numbering of the reusable
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机译：连续编号使用必需的批准以可重复使用的空连续编号为模
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摘要
The method includes the following stages: - a user of a virtual prepaid credit card is connected to a server containing a database of serial numbers which reference the customers remaining prepaid credits and the validity dates of the credit cards. The user is authenticated by the server by sending it a authentication sequence, and the server sends this sequence to a security processor which has the capacity for verification of the sequence. Once the sequence is validated the processor transmits to the server a user authorisation. After receipt of this authorisation the server acknowledges the user request, to the credit limit remaining on the card and for the valid date of it. The method is characterised in that at the time of a user request, the server sends to the processor, in addition to the authentication sequence, a version number which is associated with each card. This version number is incremented when there is zero credit on the card or when the card has expired, and this number is stored in the server database. The processor recalculates the authentication sequence, which is dependent on the version number, before verifying the cards validity.
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