Patent ID: 8884757

Claim:
An anti-tampering protection assembly for sensing tampering with at least one conductor, said anti-tampering protection assembly comprising: unpredictably varying signal generating circuitry, connected to said at least one conductor, for providing unpredictably varying signals, which are unpredictable in the sense that a potential tamperer could not ascertain what they are in sufficient time to enable him to emulate them, on said at least one conductor; and tampering sensing circuitry for sensing tampering with said at least one conductor, said unpredictably varying signal generating circuitry comprising: signal generating circuitry; and topography generation circuitry operative to vary the configuration of an effective circuit through which said signals pass, such that the Bode plot characteristics of said signals vary unpredictably, said topography generation circuitry including at least one of: applied signal location selector (ASLS) circuitry, which selects one or more locations at which one or more selected signals from a selected signal generator are applied; component selector (CS) circuitry, which selects one or more components to be placed in circuit with said one or more selected signals; component value selector (CVS) circuitry, which selects one or more component values of the selected components to be placed in circuit with said one or more selected signals; voltage level/location selector (VLLS) circuitry, which selects one or more voltage level for one or more ground, power line, and voltage clamp in circuit with said one or more selected signals; unpredictable signal origin location selector (USOLS) circuitry, which selects one or more locations from which one or more unpredictable signals are supplied to conductors; unpredictable signal supply location selector (USSLS) circuitry, which selects one or more locations at which one or more unpredictable signals are supplied; and received signal location selector (RSLS) circuitry, which selects one or more locations at which one or more received signals are received.