Electrical computers and digital processing systems: support – Data processing protection using cryptography – Tamper resistant
Reexamination Certificate
2005-10-18
2005-10-18
Barron, Jr., Gilberto (Department: 2132)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
Tamper resistant
C713S193000
Reexamination Certificate
active
06957345
ABSTRACT:
A system for protecting an electronic device from mechanical intrusion attempt. An intrusion barrier able to detect mechanical intrusion by means of circuit traces which detect any change in the resistance characteristics of the electric circuit. These circuit traces function as a resistors and they are connected together to form a Wheatstone bridge. According to the present invention the logical lay-out of these connections is selected so that the voltage difference between two adjacent traces is minimized. In this way the current leakage effect is limited to the minimum.
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Cesana Mario Leonardo
Zavatti Roberto Antonio
Barron Jr. Gilberto
International Business Machines - Corporation
Perungavoor Venkat
Scully Scott Murphy & Presser
Steinberg, Esq William H.
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