Patent ID: 11963011
Assignee: MARELLI CORPORATION
Field: Control (Instruments)
Classification: CPC G  H  B | IPC H

Claim 0:
1. A relay attack determination device for determining a relay attack, in which wireless communications between an in-vehicle device and a portable device are relayed by a relay device, comprising:
a transmitter disposed on an in-vehicle device, the transmitter being configured to transmit a first signal and a second signal having an output condition different from the first signal;
a receiver disposed on the portable device to receive the first signal and the second signal;
a strength meter disposed on the portable device to measure a reception strength by a plurality of times in each of the first signal and the second signal received by the receiver;
a comparator configured to execute a comparative process of the first signal and the second signal by using an average value of the reception strengths measured by the strength meter;
a determiner configured to determine the relay attack based upon a result of the comparative process; and
a variation calculator configured to calculate variation in the reception strength measured by the plurality of times in the strength meter regarding a signal having lower reception strength between the first signal and the second signal, wherein
in a case where the variation in the reception strength exceeds a threshold value indicating a communication failure, the determiner determines the relay attack regardless of the result of the comparative process.