Patent ID: 7015823
Filing Date: 2006-03-21
Classification: G08B,H05K

Abstract:
1. A tamper resistant circuit board comprising: a circuit board having electrically conducting paths formed thereon; at least one programmable logic component mounted on said circuit board; electronic components mounted on said circuit board and interconnected by said electrically conducting paths and by programmed paths through said at least one programmable logic component; a physical barrier coating said at least one programmable logic component, said electronic components and said circuit board, said physical barrier having a plurality of layers which are alternately electrically insulating and electrically conducting; electrical circuitry mounted on said circuit board and connected to at least one electrically conducting layer for sensing a tamperer seeking to determine construction or operation of said circuit board and for generating a tamper signal indicative of tampering; and security circuitry responsive to said tamper signal for erasing said programmed paths through said at least one programmable logic chip.