Tamper-respondent assembly with nonlinearity monitoring
First Claim
1. A tamper-respondent assembly comprising:
- at least one tamper-respondent sensor including conductive lines forming, at least in part, at least one tamper-detect network of the at least one tamper-respondent sensor;
a detector to monitor the at least one tamper-respondent sensor, the detector applying an electrical signal to the conductive lines of the at least one tamper-respondent sensor to monitor over time for a non-linear conductivity change, where the non-linear conductivity change is indicative of a tamper event at the at least one tamper-respondent sensor; and
wherein the detector monitors a second harmonic of the electrical signal applied to the conductive lines for the non-linear conductivity change indicative of the tamper event at the at least one tamper-respondent sensor.
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Accused Products
Abstract
Tamper-respondent assemblies and methods of fabrication are provided which include at least one tamper-respondent sensor and a detector. The at least one tamper-respondent sensor includes conductive lines which form, at least in part, at least one tamper-detect network of the tamper-respondent sensor(s). The detector monitors the tamper-respondent sensor(s) by applying an electrical signal to the conductive lines of the at least one tamper-respondent sensor to monitor for a non-linear conductivity change indicative of a tamper event at the tamper-respondent sensor(s). For instance, the detector may monitor a second harmonic of the electrical signal applied to the conductive lines for the non-linear conductivity change indicative of the tamper event, such as an attempted shunt of one or more conductive lines of the tamper-respondent sensor(s).
204 Citations
17 Claims
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1. A tamper-respondent assembly comprising:
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at least one tamper-respondent sensor including conductive lines forming, at least in part, at least one tamper-detect network of the at least one tamper-respondent sensor; a detector to monitor the at least one tamper-respondent sensor, the detector applying an electrical signal to the conductive lines of the at least one tamper-respondent sensor to monitor over time for a non-linear conductivity change, where the non-linear conductivity change is indicative of a tamper event at the at least one tamper-respondent sensor; and wherein the detector monitors a second harmonic of the electrical signal applied to the conductive lines for the non-linear conductivity change indicative of the tamper event at the at least one tamper-respondent sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A tamper-respondent assembly comprising:
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at least one electronic component; an enclosure surrounding, at least in part, the at least one electronic component; a tamper-respondent sensor associated with the enclosure and facilitating forming a secure volume about the at least one electronic component, the tamper-respondent sensor comprising conductive lines forming, at least in part, a tamper-detect network of the tamper-respondent sensor; a detector to monitor the tamper-respondent sensor, the detector applying an electrical signal to the conductive lines of the tamper-respondent sensor to monitor over time for a non-linear conductivity change, where the non-linear conductivity charge is indicative of a tamper event at the tamper-respondent sensor; and wherein the detector monitors a second harmonic of the electrical signal applied to the conductive lines for the non-linear conductive change indicative of the tamper event at the at least one tamper-respondent sensor. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A fabrication method comprising:
fabricating a tamper-respondent assembly, the fabricating comprising; providing at least one tamper-respondent sensor comprising conductive lines forming, at least in part, at least one tamper-detect network of the at least one tamper-respondent sensor; providing a detector to monitor the at least one tamper-respondent sensor, the detector applying an electrical signal to the conductive lines of the at least one tamper-respondent sensor to monitor over time for a non-linear conductivity change, where the non-linear conductivity charge is indicative of a tamper event at the at least one tamper-respondent sensor; and wherein the detector monitors a second harmonic of the electrical signal applied to the conductive lines for the non-linear conductivity change indicative of the tamper event at the at least one tamper-respondent sensor. - View Dependent Claims (16, 17)
Specification