Method and device for supplying a terminal of a first user with a biometric signature of a second user

An obtaining method for obtaining a biometric signature of a second user by way of a terminal of a first user, the obtaining method being implemented by the terminal of the first user and comprising:

• receiving a radio signal transmitted by a transmitter device using a near-field communication technology, via a channel using electromagnetic wave conduction capabilities of a body of the second user when the second user comes into contact with or touches a surface of the transmitter device and via a channel using the electromagnetic wave conduction capabilities of the body of the first user when the first user comes into contact with or touches the second user;
• obtaining the biometric signature of the second user from the received radio signal;
• and
• storing the obtained biometric signature of the second user in a secure memory space of the terminal of the first user.

An authentication method for authenticating a first user with a biometric signature of a second user, said method being implemented by an authentication device and comprising:

• receiving, from a terminal of the first user, data representing the biometric signature of the second user, from a radio signal transmitted by a transmitter device using a near-field communication technology, via a channel using electromagnetic wave conduction capabilities of a body of the second user when the second user comes into contact with or touches a surface of a transmitter device, and via a channel using the electromagnetic wave conduction capabilities of a body of the first user when the first user comes into contact with or touches the second user;
• obtaining characteristic data of the second user from the data representing the biometric signature of the second user;
• comparing the obtained characteristic data of the second user with reference characteristic data of the second user;
• and
• in response to the obtained characteristic data of the second user corresponding to the reference characteristic data of the second user, validating the authentication of the first user.

A transmitter device configured to supply a terminal of a first user with a biometric signature of a second user, the transmitter device comprising:

• a processor and a memory that are configured to:
• generate a radio signal using a near-field communication technology;
• and
• transmit said generated radio signal to the terminal of the first user, via a channel using electromagnetic wave conduction capabilities of a body of the second user when the second user comes into contact with or touches a surface of the transmitter device and via a channel using electromagnetic wave conduction capabilities of a body of the first user when the first user comes into contact with or touches the second user.

A terminal of a first user configured to obtain a biometric signature of a second user, the terminal of the first user comprising:

• a processor and a memory that are configured to:
• receive a radio signal transmitted by a transmitter device using a near-field communication technology, via a channel using electromagnetic wave conduction capabilities of a body of the second user when the second user comes into contact with or touches a surface of the transmitter device and via a channel using electromagnetic wave conduction capabilities of a body of the first user when the first user comes into contact with or touches the second user;
• obtain the biometric signature of the second user from the received radio signal;
• and
• store the obtained biometric signature of the second user in a secure memory space of the terminal of the first user.

An authentication device for authenticating a first user with a biometric signature of a second user, the authentication device comprising:

• a processor and a memory that are configured to:
• receive, from a terminal of the first user, data representing the biometric signature of the second user;
• obtain characteristic data of the second user from the data representing the biometric signature of the second user;
• compare the obtained characteristic data of the second user with reference characteristic data of the second user;
• and
• in response to the obtained characteristic data of the second user corresponding to the reference characteristic data of the second user, validate the authentication of the first user.