| 发明名称 |
Method and apparatus for verifying the integrity of a smart card. |
| 摘要 |
<p>A Contact Smart Card (3) is inserted in a contact card reader and its capacitance is 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 from the resistor (1) and the output is monitored in an amplitude detector (2) connected to receive the signal output from the resistor (4) and to compare it against a threshold level for the signal previously established and stored for an acceptable card. <IMAGE></p> |
| 申请公布号 |
EP0619560(A1) |
申请公布日期 |
1994.10.12 |
| 申请号 |
EP19940301437 |
申请日期 |
1994.03.01 |
| 申请人 |
GPT LIMITED |
发明人 |
DE BORDE, DUNCAN O. |
| 分类号 |
G06K7/00;G06K17/00;G07F7/10;(IPC1-7):G06K7/06;G06K19/073 |
主分类号 |
G06K7/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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