Patent ID: 11156704

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. The challenge message and/or the response message are transmitted by a transmission protocol in which the bit sequence (C, R) of the corresponding message is transmitted by a transformed spreading code chip sequence (TCSCS, TRSCS), wherein the transformed spreading code chip sequence (TCSCS, TRSCS) is obtained by transforming a spreading code chip sequence (CSCS, RSCS) of the bit sequence (C, R) on the basis of a transform function (ftrans).