| 摘要 |
An access control system (10) comprises a server (12) suitable for controlling access; a biometric signal sensor (11); and an interface device (13) suitable for hooking up with the server and with the sensor, access being authorized to a person associated with a reference signal. The server and the interface device manage a common parameter that takes different values over time, and, respectively a first and a second non-invertible transformation function, these functions being parameterized as a function of the common parameter. The sensor senses a biometric signal and provides it to the interface device. At the interface device level, a transformed biometric signal is obtained by applying the first function to an element from the group comprising a characteristic emanating from the sensed signal and the sensed signal, then transmitted (14) to the server. At the server level, a comparison of the transformed biometric signal with a comparison signal is performed, said comparison signal resulting from the application of the second function to an initial signal arising from the reference signal. Finally, a decision is made on the basis of the comparison as to whether access is authorized. |
