The present invention relates to a portable electronic authentication device (10) for providing access to a site or computer resource or secure location. The portable electronic device comprises a first communication means (11) and a second communication means (12) different from the first communication means. The first communication means is intended to receive an interrogation signal (S P) from a control device of a control system, which includes the portable electronic device. The second communication means 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 to allow access to a site or computer resource or place. secured.
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