Data protection by detection of intrusion into electronic assemblies
First Claim
1. An electronic circuit comprising;
- a circuit card;
a plurality of electronic circuit components disposed on said circuit card;
said components including an electronic assembly;
a barrier for protecting against intrusions into said electronic assembly including;
screen means surrounding said electronic assembly, said screen means including a unitary flexible membrane wrapped around said electronic assembly and line means formed on said membrane in a pattern that resists access without disturbing said line means, said line means being formed of discrete conductive particles of material disposed in a solidified matrix of material, the resistance of said line means changing when said line means are disturbed,encapsulating material encapsulating said line means and bonded to said line means said bond strength of line means to the membrane having a first predetermined strength and said bond strength of the encapsulating material to the line means having a second predetermined strength said second predetermined strength being greater than said first predetermined strength;
and, electrical supply and signal detection means adapted to supply an input signal to said line means and generate an output signal responsive to a given change in said resistance of said line means;
whereby said resistance of said line means changes, a signal will be generated.
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Accused Products
Abstract
The present invention provides an intrusion barrier for protecting against mechanical or chemical intrusion into an electronic assembly, especially one containing volatile memory. It includes a screen material surrounding the electronic assembly which screen material has formed thereon fine conductive lines in close proximity to each other. The lines are formed of conductive particles of material dispersed in a solidified matrix of a material which looses its mechanical integrity when removed from the screen. An electrical supply and signal detection circuit is provided which generates an output signal responsive to a given change in resistance of the conductive lines, such that if the resistance changes are a result of a mechanical or chemical attack, a signal is generated which can cause the erasure of the volatile memory. Also, preferably radiation detection and temperature sensing circuits are provided to cause erasure of the volatile memory responsive to detection of a given intensity of radiation or a temperature below a given value.
190 Citations
21 Claims
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1. An electronic circuit comprising;
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a circuit card; a plurality of electronic circuit components disposed on said circuit card; said components including an electronic assembly; a barrier for protecting against intrusions into said electronic assembly including; screen means surrounding said electronic assembly, said screen means including a unitary flexible membrane wrapped around said electronic assembly and line means formed on said membrane in a pattern that resists access without disturbing said line means, said line means being formed of discrete conductive particles of material disposed in a solidified matrix of material, the resistance of said line means changing when said line means are disturbed, encapsulating material encapsulating said line means and bonded to said line means said bond strength of line means to the membrane having a first predetermined strength and said bond strength of the encapsulating material to the line means having a second predetermined strength said second predetermined strength being greater than said first predetermined strength; and, electrical supply and signal detection means adapted to supply an input signal to said line means and generate an output signal responsive to a given change in said resistance of said line means; whereby said resistance of said line means changes, a signal will be generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification