Method for making security systems more tamper resistant and a security system
First Claim
Patent Images
1. A method for making a security system more tamper resistant, the security system including a control processor and at least one detection circuit monitored by the control processor, the at least one detection circuit having at least one detector, the method comprising:
- (a) monitoring at least one electrical reference characteristic selected from resistance, capacitance, impedance and inductance in the at least one detection circuit; and
(b) generating random periodic changes to the at least one electrical reference characteristic in order to detect any tampering with the at least one electrical reference characteristic in the at least one detection circuit, said random periodic changes being generated internally by the security system.
0 Assignments
0 Petitions
Accused Products
Abstract
A method for making a security system more tamper resistant involving the step of monitoring an electric reference characteristic in a detection circuit of a security system and generating random periodic changes to the electrical reference characteristic in order to detect any tampering with the electric reference characteristic in the detection circuit.
-
Citations
22 Claims
-
1. A method for making a security system more tamper resistant, the security system including a control processor and at least one detection circuit monitored by the control processor, the at least one detection circuit having at least one detector, the method comprising:
-
(a) monitoring at least one electrical reference characteristic selected from resistance, capacitance, impedance and inductance in the at least one detection circuit; and
(b) generating random periodic changes to the at least one electrical reference characteristic in order to detect any tampering with the at least one electrical reference characteristic in the at least one detection circuit, said random periodic changes being generated internally by the security system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for making a security system more tamper resistant, the security system including a control processor and at least one detection circuit monitored by the control processor, the at least one detection circuit having at least one detector, the method comprising:
-
(a) providing a plurality of adjustable resistances at several locations in the at least one detection circuit, each adjustable resistance including both shunt and series resistances;
(b) monitoring resistance in the at least one detection circuit; and
(c) generating random periodic changes to resistance in at least one of the adjustable resistances in order to detect any tampering with resistance in the at least one detection circuit, said random periodic changes being generated internally by the security system. - View Dependent Claims (10, 11, 12, 13, 14)
-
-
15. A security system, comprising:
-
(a) a control processor;
(b) at least one detection circuit monitored by the control processor, the at least one detection circuit having at least one detector; and
(c) one of the control processor and a monitoring unit configured to monitor at least one electrical, reference characteristic selected from resistance, capacitance, impedance and inductance in the at least one detection circuit and generate random periodic changes to the at least one electrical reference characteristic in order to detect any tampering with the at least one electrical reference characteristic in the at least one detection circuit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
Specification