Intrusion Detection and Communication
First Claim
1. A method comprising:
- storing a baseline value of a phase delay between a signal generated by a first integrated circuit (IC) and a signal received at the first IC from a second IC, the first IC and the second IC located on a circuit board;
measuring a test value of a phase delay between a signal generated by the first IC and a signal received at the first IC;
determining a difference between the test value of the phase delay and the baseline value of the phase delay; and
generating a notification signal identifying a tampering with the circuit board if the difference is larger than a threshold.
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Accused Products
Abstract
An intrusion detection system disclosed herein includes a detector circuit that measures a change in value of impedance of an interconnection circuitry. A decoder coupled to the detector decodes the measured value of the change in the impedance of the interconnection circuitry to determine existence of an abnormal condition. In an example implementation of the intrusion detection system, the change in the value of the impedance of the interconnection circuitry is represented by a change in the phase delay on the interconnection circuitry. An implementation of the intrusion detection circuit terminates communication using the interconnection circuitry upon detection of the abnormal condition. The intrusion detection system is further configured to interpret the abnormal condition as a communication signal to the interconnection circuitry.
28 Citations
20 Claims
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1. A method comprising:
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storing a baseline value of a phase delay between a signal generated by a first integrated circuit (IC) and a signal received at the first IC from a second IC, the first IC and the second IC located on a circuit board; measuring a test value of a phase delay between a signal generated by the first IC and a signal received at the first IC; determining a difference between the test value of the phase delay and the baseline value of the phase delay; and generating a notification signal identifying a tampering with the circuit board if the difference is larger than a threshold. - View Dependent Claims (2, 3, 4, 5, 9, 10, 11, 12)
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6. A device comprising:
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a detector configured to measure a change in value of an operating characteristics of an interconnection circuitry, the operating characteristics of the interconnection circuitry being dependent upon an impendence of the interconnection circuitry; and a decoder coupled to the detector to receive the measured value of the operating characteristics from the detector and configured to decode the measured value of the operating characteristics to determine existence of an abnormal condition. - View Dependent Claims (7, 8, 13)
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14. A device comprising:
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a detector configured to measure a change in value of an impedance of a circuitry in response to an external input; and a decoder configured to decode the measured value of the change to determine existence of an abnormal condition. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification