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 of the data packet signal;
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; 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.
43 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 of the data packet signal; 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; 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 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 the 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 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; 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