Claims
- 1. A system for preventing reverse-engineering of a device, said system comprising:
a cocoon surrounding at least a portion of said device, said cocoon being characterized by a set of electrical characteristics, wherein at least one of said electrical characteristics changes in result to mechanical manipulation of said cocoon; an integrated circuit configured to send an input signal to said cocoon and receive a response signal from said cocoon, wherein said response signal is responsive to said change in said at least one electrical characteristic of said cocoon; said integrated circuit further configured to take a predetermined action in the event that said response signal is indicative of said mechanical manipulation.
- 2. The system of claim 1, wherein said set of electrical characteristics includes capacitance.
- 3. The system of claim 1, wherein said set of electrical characteristics includes resistance.
- 4. The system of claim 1, further including an external variable resistor.
- 5. The system of claim 1, further including an external variable capacitor.
- 6. The system of claim 1, wherein said cocoon comprises a bulk material, and wherein said electrical characteristics correspond to electrical characteristics of said bulk material.
- 7. The system of claim 1, wherein said cocoon comprises a wire wrapped around a portion of said device.
- 8. The system of claim 1, wherein aid cocoon comprises a matrix of conductive material surrounding a portion of said device.
- 9. The system of claim 1, wherein said cocoon comprises a ribbon wrapped around a portion of said device.
- 10. The system of claim 1, wherein said cocoon comprises an epoxy.
- 11. The system of claim 1, further comprising a microprocessor interposed between said cocoon and said integrated circuit.
- 12. The system of claim 1, wherein said input signal comprises a step input, and wherein said response signal is a first-order step response of said cocoon to said step input.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority from Provisional Patent Application Ser. No. 60/269,312 filed Feb. 16, 2001.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60269312 |
Feb 2001 |
US |