| 摘要 |
The method involves sending the user identifier from the module to an access control unit via a telecommunications network, determining a new sequence number for the identifier, sending it to the module, comparing with a stored old number, sending a message with the old number to the control unit if the difference exceeds a threshold, sending both numbers and the identifier to a detection unit based on the message and storing a detection record. The method involves transmitting the user identifier from the module (2) to a computer-based access control unit (3) via a telecommunications network (6), determining a new sequence number associated with the identifier, sending it to the module, comparing with an old number stored in the module, sending a message with the old number to the control unit if the difference exceeds a defined value, sending the new and old numbers and the identifier to a detection unit (5) based on the message and storing a detection record with the user identifier
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