Abstract: Device for secure distance measurement being a prover (P) or a verifier (V) comprising: a receiver (R3) configured to receive a receiving signal (RS) with a transmitted message (M) encoded therein, wherein the transmitted message (M) contains a verifying bit sequence (VBS), wherein a bit of the transmission message (M) is transmitted in the transmission signal (TS) by a pulse with a pulse modulation parameter with two pulse states, and a decoder (R2) configured to decode the verifying bit sequence (VBS) from the transmitted message (M) encoded in the receiving signal (RS).

Abstract: Method for secure distance measurement comprising the following steps: transmitting from a verifier (V) to a prover (P) a challenge message comprising a challenge bit sequence (C); transmitting from the prover (P) to the verifier (V) a response message comprising the response bit sequence (R); verifying, in the verifier (V), the response message on the basis of the response bit sequence (R); and determining, in the verifier (V), the distance between the verifier (V) and the prover (P) on the basis of the time difference between the challenge message and the response message.

Abstract: Apparatus for determining a time of arrival of a message signal comprising: a quadrature mixer (13, 14) for mixing a received message signal with the signal of a local oscillator, wherein the received message signal comprises a binary sequence modulated by binary frequency shift keying with pulses corresponding to a first value at a first frequency and with pulses corresponding to a second value at a second frequency, wherein the local oscillator has a frequency between the first frequency and the second frequency; a time of arrival detector (18) for determining a time of arrival of the message signal on the basis of the output of the quadrature mixer (13, 14).