Leakage characterization and management for electronic circuit enhancement

Patent metadata

Field	Value
Publication number	US-11493565-B2
Application number	US-201916702160-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Dec 3, 2019
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

An electronic system can include an electronic module and a trace circuit that provides a perimeter that encloses the electronic module. A sensing circuit within the electronic system can be configured to detect a discontinuity in the perimeter. In response to detecting the discontinuity in the perimeter, the sensing circuit can initiate, from a response device, a response signal.

First claim

What is claimed is:

1. An electronic system comprising:
an electronic module;
a cover that encloses the electronic module;
a trace circuit attached to an inside surface of the cover and providing a perimeter that encloses the electronic module, wherein the trace circuit includes a dielectric material located between electrically conductive layers, the dielectric material having:
a characterized electrical leakage that is less than a specified electrical leakage value; and
a characterized electrical leakage that varies less than a specified amount

over an operating temperature range,

wherein the trace circuit further includes a supplemental dielectric material, and wherein amounts of the dielectric material and of the supplemental dielectric material are included that result in a leakage of the trace circuit that is less than a leakage threshold value; and
a sensing circuit configured to:
detect a discontinuity in the perimeter; and
initiate, in response to a detection, an action from a] response device.

2. The electronic system of claim 1 , wherein:
the electronic system is a cryptography security system;
the electronic module is a cryptography module;
the perimeter is a secure perimeter surrounding the cryptography module; and
the sensing circuit is configured to detect an attempted violation of the secure perimeter.

3. The electronic system of claim 1 , wherein the action that signals a discontinuity in the perimeter is selected from the group consisting of: deleting encryption keys within the electronic module, sending an email notification, sending a Short Messaging Service (SMS) notification, illuminating an indicator and sounding an audible alarm.

4. The electronic system of claim 1 , wherein the sensing circuit is configured to detect a discontinuity in the perimeter by detecting a resistance of the trace circuit that indicates the discontinuity in the perimeter.

5. The electronic system of claim 1 , wherein the trace circuit is fabricated as a flexible circuit.

6. The electronic system of claim 1 , wherein the response device is selected from the group consisting of: a processor circuit, a service processor, the electronic module and a network-connected device.

7. The electronic system of claim 1 , wherein the perimeter of the trace circuit includes a first electrically conductive serpentine trace.

8. The electronic system of claim 7 , wherein the trace circuit includes a second electrically conductive serpentine trace electrically insulated from the first electrically conductive serpentine trace by a dielectric layer.

9. The electronic system of claim 1 , wherein the dielectric material is capable of reducing power consumption of the electronic system, and thereby capable of increasing and extending the life of a battery used to power the electronic system.

10. A method for designing an electronic system for managed battery life and managed electronic data security for an electronic module, the method comprising:
receiving design requirements for the electronic system;
characterizing dielectric materials that are candidates for use in the electronic system;
choosing, from candidate dielectric materials, a dielectric material in accordance with the design requirements, wherein the choosing includes selecting a dielectric material having:
a characterized electrical leakage that is less than a specified electrical leakage value; and
a characterized electrical leakage that varies less than a specified amount over an operating temperature range;

designing a trace circuit to include a chosen dielectric material;
fabricating the trace circuit in accordance with the trace circuit design; and
integrating the trace circuit into the electronic system by:
surrounding the electronic module with a cover and attaching the trace circuit to an inner surface of the cover to provide a perimeter that encloses the electronic module;
electrically interconnecting the trace circuit to a sensing circuit and choosing, in accordance with the design requirements, a supplemental dielectric material,

wherein the designing of the trace circuit includes the dielectric material and the supplemental dielectric material, and the designing of the trace circuit includes specifying amounts of the dielectric material and of the supplemental dielectric material that result in a leakage of the trace circuit that is less than a leakage threshold value.

11. The method of claim 10 , wherein:
the electronic system is a cryptography security system;
the electronic module is a cryptography module;
the perimeter is a secure perimeter surrounding the cryptography module;
the sensing circuit is configured to detect an attempted violation of the secure perimeter; and
the electronic system design requirements include a minimum operational life of a battery configured to power the electronic system.

12. The method of claim 11 , wherein the minimum operational life of a battery configured to power the electronic system is specified by a published cryptosecurity specification.

13. The method of claim 10 , wherein characterizing candidate dielectric materials includes characterizing electrical leakage properties, including temperature dependent electrical leakage variation, of the candidate dielectric materials.

14. The method of claim 10 , wherein the candidate dielectric materials include materials selected from the group consisting of: an adhesive dielectric material and clad dielectric material sheet.

15. A method for operating an electronic system for managed battery life and managed electronic data security for an electronic module, the method comprising:
applying, with a sensing circuit, a voltage to a trace circuit that is attached to an inner surface of a cover that encloses an electronic module, wherein the trace circuit is configured to provide a perimeter that encloses the electronic module, and the trace circuit includes dielectric material located between electrically conductive layers, the dielectric material having:
a characterized electrical leakage that is less than a specified electrical leakage value; and
a characterized electrical leakage that varies less than a specified amount over an operating temperature range,

wherein the trace circuit further includes a supplemental dielectric material, and wherein amounts of the dielectric material and of the supplemental dielectric material are included that result in a leakage of the trace circuit that is less than a leakage threshold value;
measuring, with the sensing circuit, a sensed voltage on the trace circuit;
comparing the sensed voltage to a voltage threshold to detect a discontinuity in the perimeter; and
initiating, with a response device electrically interconnected to the sensing circuit, an action in response to the sensed voltage indicating the discontinuity in the perimeter.

16. The method of claim 15 , wherein:
the electronic system is a cryptography security system;
the electronic module is a cryptography module;
the response device is selected from the group consisting of: the electronic module, a processor circuit, a network-connected device and a service processor;
the perimeter is a secure perimeter surrounding the cryptography module; and
the sensing circuit is configured to detect an attempted violation of the secure perimeter surrounding the cryptography module.

17. The method of claim 16 , wherein the response that signals a discontinuity in the perimeter is selected from the group consisting of: deleting encryption keys within the electronic module, sending an

Assignees

• IBM

Inventors

• Doyle Matthew
• Busby James
• Cohen Edward N
• Dangler John R
• Fisher Michael
• Higby Arthur
• Long David Clifford

Classifications

• H05K1/189

  characterised by the use of flexible or folded printed circuits · CPC title

• G01R31/54 Primary

  Testing for continuity · CPC title

• H05K1/0275

  Security details, e.g. tampering prevention or detection · CPC title

• G06F21/87 Primary

  by means of encapsulation, e.g. for integrated circuits · CPC title

• H05K3/0005

  for designing circuits by computer · CPC title