Communications with interaction detection
First Claim
1. A method comprising:
- communicating a signal waveform, having a data symbol with a leading portion and authentication information therein, between a first remote circuit and a second local circuit via which access to a vehicle is facilitated;
at the local circuit, detecting interaction, by a third circuit, with the signal waveform transmitted from the first remote circuit bydetecting variations in characteristics of the leading portion of the data symbol relative to characteristics of the leading portion of the signal waveform,determining a condition indicative of whether the signal waveform has been interacted with and retransmitted, in response to the detected variations in characteristics being indicative of a type of variation induced by interaction and retransmission; and
generating an output signal that provides vehicle access based on the determined condition.
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Accused Products
Abstract
Aspects of the disclosure are directed to detecting interactions with signals, such as by an attacker attempting to gain access to a vehicle. Signal waveforms used for authentication are evaluated, for communications between respective circuits. Possible interaction by a third circuit is analyzed by detecting variations in characteristics of a leading portion of a data symbol relative to known characteristics of the leading portion of the data signal. A condition indicative of whether the signal waveform has been interacted with and retransmitted is determined, based on the detected variations. For instance, if the variations are indicative of a known type of variation induced by interaction and retransmission, such interaction and transmission can be detected. Where the determined condition is not deemed an attack, an output signal that provides vehicle access is generated based on the determined condition.
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Citations
20 Claims
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1. A method comprising:
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communicating a signal waveform, having a data symbol with a leading portion and authentication information therein, between a first remote circuit and a second local circuit via which access to a vehicle is facilitated; at the local circuit, detecting interaction, by a third circuit, with the signal waveform transmitted from the first remote circuit by detecting variations in characteristics of the leading portion of the data symbol relative to characteristics of the leading portion of the signal waveform, determining a condition indicative of whether the signal waveform has been interacted with and retransmitted, in response to the detected variations in characteristics being indicative of a type of variation induced by interaction and retransmission; and generating an output signal that provides vehicle access based on the determined condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a first communication circuit configured and arranged to communicate a signal waveform, having a data symbol with a leading portion and authentication information therein, between a remote circuit and a local circuit via which access to a vehicle is facilitated; a second detection circuit configured and arranged to detect interaction, by a third circuit, with the signal waveform transmitted from the remote circuit by detecting variations in characteristics of the leading portion of the data symbol relative to characteristics of the leading portion of the signal waveform, determining a condition indicative of whether the signal waveform has been interacted with and retransmitted, in response to the detected variations in characteristics being indicative of a type of variation induced by interaction and retransmission; and a third output circuit configured and arranged to generate an output signal that provides vehicle access based on the determined condition. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus comprising:
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a remote communication circuit configured and arranged to communicate data for access to a vehicle that is distance-limited; and a vehicle access circuit configured and arranged with the remote communication circuit to control locking of an entry door to the vehicle by detecting a signal waveform corresponding to a signal transmitted by the remote communication circuit, the signal waveform having a data symbol with a leading portion and authentication information therein, comparing variations in characteristics of the leading portion of the data symbol relative to characteristics of the leading portion of the signal waveform, determining a condition indicative of whether the signal waveform has been interacted with and retransmitted, based on the comparing of the variations in characteristics being indicative of a type of variation induced by interaction and retransmission, and generating an output signal that controls locking of the entry door based on the determined condition.
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Specification