ELECTRONIC DATA SECURITY APPARATUS

摘要

An apparatus for providing security for an integrated circuit (IC) chip is disclosed. The apparatus may include the IC chip, attached to a surface of a printed circuit board (PCB). The PCB may include a first, electrically insulative, conformal coating layer attached to the PCB surface and to exposed IC chip surfaces. The PCB may also include a Wheatstone bridge circuit to indicate changes to a second, X-ray opaque, optically opaque and electrically resistive, conformal coating layer. The circuit may include four resistors, formed from second conformal coating layer regions, four sets of electrically conductive pads on the PCB, each set electrically connected to a resistor of the four resistors. The circuit may also include a voltage source, connected to two conductive pads and a monitoring device, connected to another two conductive pads and configured to detect a change of resistance of the Wheatstone bridge.

主权项

1. A method for fabricating, for an integrated circuit (IC) chip attached to a surface of a printed circuit board (PCB), a security apparatus including a Wheatstone bridge circuit, the method comprising:
creating, on the surface of the PCB, four sets of at least two electrically conductive pads; depositing a first conformal coating layer that is electrically insulative upon at least the surface of the PCB and exposed surfaces of the IC chip; creating openings, corresponding to the four sets of at least two electrically conductive pads, in the first conformal coating layer; depositing a second conformal coating layer that is X-ray opaque, optically opaque and electrically resistive onto the first conformal coating layer; and creating four resistors of the Wheatstone bridge circuit by removing material to divide the second conformal coating layer into four regions.