Relay attack prevention
First Claim
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1. A method comprising:
- receiving a wireless data packet signal from a transmitter, the data packet signal including a data packet, the data packet including payload data and further information;
determining, from received signal strength values of the data packet signal, first information related to a sequence of received signal strength levels in different data packet portions;
extracting the further information from the received data packet;
determining, based on the further information included in the data packet, second information related to a sequence of expected signal strength levels in the different data packet portions; and
determining whether the first information corresponds to the second information.
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Abstract
Embodiments related to transmission of data packets are described and depicted.
34 Citations
25 Claims
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1. A method comprising:
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receiving a wireless data packet signal from a transmitter, the data packet signal including a data packet, the data packet including payload data and further information; determining, from received signal strength values of the data packet signal, first information related to a sequence of received signal strength levels in different data packet portions; extracting the further information from the received data packet; determining, based on the further information included in the data packet, second information related to a sequence of expected signal strength levels in the different data packet portions; and determining whether the first information corresponds to the second information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A transmitter device comprising:
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a data packet generator, the data packet generator configured to form a data packet including data and further information, the further information being related to a sequence of signal strength levels in different data packet portions by a predetermined rule; and a transmission signal generator, the transmission signal generator being configured to modulate the data packet on a wireless carrier signal and to provide a sequence of different signal strength levels in different data packet portions in correspondence with the sequence of signal strength levels. - View Dependent Claims (22, 23)
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24. A method comprising:
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transmitting a wireless data packet from a transmitter to a receiver, wherein transmitting the wireless data packet comprises; modulating the data packet on a wireless carrier signal to obtain a wireless modulated transmission signal; and impressing a signal strength fingerprint on different data packet portions of the modulated transmission signal, wherein the impressed signal strength fingerprint is related to fingerprint identifier information included in the data packet by a rule pre-known to the transmitter and receiver.
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25. A receiver device comprising:
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a receiver circuit to receive a data packet including data and further information; a circuit to determine first information related to a sequence of signal strength levels, the sequence of signal strength levels corresponding to signal strength levels measured in different portions of the data packet; a processing circuit to extract the further information from the data packet and to determine from the further information second information related to an expected sequence of signal strength levels in different portions of the data packet; and a validation circuit to validate the data packet, the validation circuit being configured to validate the data packet based on a comparing of the first information with the second information.
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Specification