A method for authenticating, applied to a user device (210, 220), the user device (210, 220) and a vehicle module established a connection channel through a wireless mode, wherein the method comprises: receiving a first wireless signal through the connection channel from the vehicle module; acquiring a first signal strength sequence, the first signal strength sequence are generated by N continuous signal strength characteristics PF UDev of the first wireless signal; communicating the first signal strength sequence to the vehicle module, receiving a second signal strength sequence from the vehicle module, the second signal strength sequence are generated based by N continuous signal strength characteristics PF Veh of a second wireless signal, the second wireless signal is received by the vehicle module from the user device (210,220) through the connection channel; authenticating the connection between the user device (210,220) and the vehicle module based on the first signal strength sequence and the second signal strength sequence; characterized in that the first signal strength sequence comprises a user string S UDev and a Correction Data C; and wherein the method further comprises: filtering the N continuous signal strength characteristics PF UDev by a low pass filter; generating the user string S UDev and the Correction Data C by providing the filtered N continuous signal strength characteristics PF UDev to a Generate, Gen, function of the Fuzzy Extractor mechanism; the Correction Data C and the N continuous signal strength characteristics PF Veh are filetered and provided to a Reproduce, Rep, function of the Fuzzy Extractor mechanism by the vehicle module to generate a user string S veh, and the authenticating the connection between the user device (210, 220) and the vehicle module comprises: based on the user string S UDev and the vehicle string S Veh authenticating the connection between the user device (210, 220) and the vehicle module. receiving a first wireless signal through the connection channel from the vehicle module; acquiring a first signal strength sequence, the first signal strength sequence are generated by N continuous signal strength characteristics PF UDev of the first wireless signal; communicating the first signal strength sequence to the vehicle module, receiving a second signal strength sequence from the vehicle module, the second signal strength sequence are generated based by N continuous signal strength characteristics PF Veh of a second wireless signal, the second wireless signal is received by the vehicle module from the user device (210,220) through the connection channel; authenticating the connection between the user device (210,220) and the vehicle module based on the first signal strength sequence and the second signal strength sequence; characterized in that the first signal strength sequence comprises a user string S UDev and a Correction Data C; and wherein the method further comprises: filtering the N continuous signal strength characteristics PF UDev by a low pass filter; generating the user string S UDev and the Correction Data C by providing the filtered N continuous signal strength characteristics PF UDev to a Generate, Gen, function of the Fuzzy Extractor mechanism; the Correction Data C and the N continuous signal strength characteristics PF Veh are filetered and provided to a Reproduce, Rep, function of the Fuzzy Extractor mechanism by the vehicle module to generate a user string S veh, and the authenticating the connection between the user device (210, 220) and the vehicle module comprises: based on the user string S UDev and the vehicle string S Veh authenticating the connection between the user device (210, 220) and the vehicle module. filtering the N continuous signal strength characteristics PF UDev by a low pass filter; generating the user string S UDev and the Correction Data C by providing the filtered N continuous signal strength characteristics PF UDev to a Generate, Gen, function of the Fuzzy Extractor mechanism; the Correction Data C and the N continuous signal strength characteristics PF Veh are filetered and provided to a Reproduce, Rep, function of the Fuzzy Extractor mechanism by the vehicle module to generate a user string S veh, and the authenticating the connection between the user device (210, 220) and the vehicle module comprises: based on the user string S UDev and the vehicle string S Veh authenticating the connection between the user device (210, 220) and the vehicle module.