Patent ID: 8680968

Claim:
Access control method in an access control system comprising: an access control server capable of controlling access; at least one biometric signal sensor; and an interface device adapted to be linked to the control server and to the sensor; said access being authorized for at least one person with whom a reference signal, comprising corresponding biometric information, is associated; the control server and the interface device managing a common parameter taking different values over time managing a first and a second non-invertible transformation function, said first and second transformation functions being parameterized using at least said common parameter; said method comprising the following steps: /a/ at the level of the sensor, collecting a biometric signal and providing said collected biometric signal to the interface device; /b/ at the level of the interface device, obtaining a transformed biometric signal by applying the first transformation function to an element from a group comprising at least one characteristic originating from said collected biometric signal and said collected biometric signal; and transmitting said transformed biometric signal to the control server; /c/ at the level of the control server, carrying out a comparison of the transformed biometric signal with at least one comparison signal, said comparison signal corresponding to a signal resulting from the application of the second transformation function to an initial signal originating from the reference signal; and /d/ on the basis of said comparison, deciding if access is authorized.