Abstract: This method for dispensing banknotes from an automated teller machine includes, after authentication of a user, a step (122) of dispensing, by an automated teller machine, of banknotes corresponding to a predetermined amount. It involves the establishment (104) of a mobile communication channel between a portable apparatus of the user close to the automated teller machine, and an authentication unit; downloading (110), by the automated teller machine, of a digital code from the authentication unit; transmission (114), by the portable apparatus, via the secured mobile communication channel, to the authentication unit, of a sound signal generated from the digital code and transmitted by the automated teller machine; authentication (118) of the user by the authentication unit; and transmission (122) to the automated teller machine of an instruction to activate the automaton to dispense banknotes corresponding to the predetermined amount.

Abstract: A method of authenticating the user (U) of a terminal (2) connected to an Internet type network. A communications channel is set up in a secure mobile telephony network (GSM) between mobile equipment (3) of the user (U) situated close to the terminal (2) and an authentication unit (1). The terminal (2) downloads (E30) an auto-run digital code from the authentication unit (1). The mobile equipment sends (E40) a sound signal via the mobile communications channel to the authentication unit (1), the sound signal being generated (E35) by the terminal (2) on the basis of the digital code. The user (U) is authenticated on the basis of the sound signal received (E40) via the mobile communications channel (GSM), and on the basis of an identifier (GSM_No) of the mobile equipment (3).