A portable electronic authentication device (10) for providing access to a website or a computer resource or a secure place. The portable electronic device includes a first communication unit (11) and a second communication unit (12) different from the first communication unit. The first communication unit is intended to receive an interrogation signal (SP) from a control device of a control system, which includes the portable electronic device. The second communication unit is intended to transmit a response signal (SL) which includes identification data of the portable electronic device to authenticate the portable electronic device in the control system and allow access to a website or a computer resource or a secured place.