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1. (WO2018145808) PROTECTION AGAINST A RELAY ATTACK

Pub. No.:    WO/2018/145808    International Application No.:    PCT/EP2018/000047
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Tue Feb 06 00:59:59 CET 2018
IPC: G01S 5/02
H04W 12/08
H04W 4/02
G07C 9/00
Applicants: GIESECKE+DEVRIENT MOBILE SECURITY GMBH
Inventors: FINKENZELLER, Klaus
STÖHR, Volker
Title: PROTECTION AGAINST A RELAY ATTACK
Abstract:
The invention relates to a method for protecting against a relay attack on a system which consists of at least one first 2 and a second communication device 4. Data is transmitted wirelessly between the first 2 and the second communication device 4. The first communication device 2 determines a first spectrum of all wirelessly transmitted signals to be received at the location of the first communication device 2 within a frequency band. The second communication device 4 likewise determines a second spectrum of all wirelessly transmitted signals to be received at the location of the second communication device 4 within the frequency band. The frequency band is delimited by a minimum and a maximum frequency. The second communication device 4 transmits the second spectrum to the first communication device 2, and the first communication device 2 compares the first spectrum with the second spectrum in order to ascertain whether the second communication device 4 is located at the location of the first communication device 2.