Relay attack determination device
AssigneeMarelli Corporation
InventorYuki Mori
Life of this patent
Estimating the term…
Abstract
A strength meter in a relay attack determination device is disposed on a portable device and measures a reception strength by a plurality of times in each of a request signal and a request signal received from an in-vehicle device. A comparator executes a comparative process of the request signal and the request signal by using average values of the reception strength measured by the strength meter. A variation calculator calculates variation in the reception strength measured by a plurality of times in the strength meter regarding the request signal. The comparator, in a case where the variation in the reception strength exceeds a threshold value indicating a communication failure in the request signal, determines the relay attack regardless of a result of the comparative process.
Claims7
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.
Dependencies are inferred from the claim text.