Tamper resistant card enclosure with improved intrusion detection circuit
AssigneeInternational Business Machines Corporation
InventorsMario Leonardo Cesana, Roberto Antonio Zavatti
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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.
Claims7
A tamper resistant enclosure for protecting an electronic device comprising an intrusion detection barrier with a plurality of circuit traces for detecting mechanical intrusion attempts which cause a change in the resistance of said circuit traces, the circuit traces being connected according to a logical layout, the logical layout of the circuit traces being selected so that, in use, the voltage differences between adjacent circuit traces are minimized.
Dependencies are inferred from the claim text.