Method and apparatus for verifying the integrity o

专利名称：Method and apparatus for verifying the

integrity of a smart card

发明人：Duncan O. De Borde申请号：US08/218766申请日：19940328公开号：US0123A公开日：19950516

摘要：A Contact Smart Card (3) is inserted in a contact card reader and its capacitanceis measured by applying a square wave generated by an oscillator (1) to it via a resistor(4). The capacitance effect of the smart card (3) affects the amplitude of the output fromthe resistor (1) and the output is monitored in an amplitude detector (2) connected toreceive the signal output from the resistor (4) and to compare it against a threshold levelfor the signal previously established and stored for an acceptable card.

申请人：GPT LIMITED

代理机构：Kirschstein, Ottinger, Israel & Schiffmiller

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