Patent ID: 8799670

Claim:
A biometric authentication method, with an authentication server, of a user to be authenticated, using a portable object comprising at least one biometric sensor, the portable object being adapted to cooperate with a terminal, the method comprising: capturing, by the portable object, a biometric sample to be compared, coming from the user to be authenticated, transmitting, by the authentication server, a challenge to the portable object; encryption, by the portable object, of the biometric sample to be compared using the challenge, generating an encrypted biometric sample; transmitting, by the portable object, the encrypted biometric sample to the authentication server, as a response to the challenge, and validation, by the authentication server, of the response to the challenge; decryption, by the authentication server, of the encrypted biometric sample to obtain the biometric sample; determining, by the authentication server, a signature to be authenticated using the biometric sample, the signature being determined by applying a signature creation algorithm to the biometric sample; and comparing the signature to be authenticated with a reference signature and thereby authenticating the user without any signature transiting through the terminal or through a communication network and without any biometric sample being directly used in the server for the step of comparing.