| 摘要 |
<p>A card protection device and method of protecting data stored on a contactless smartcard are disclosed. The card protection device may include an antenna, a detector circuit, and an alerting circuit. The antenna may include a magnetic loop that is coupled to a tuning circuit responsive to magnetic field emissions in a frequency band associated with contactless smartcard communications. The detector circuit is coupled to the antenna and may include control logic for attenuating the magnetic field emissions based on smartcard operating characteristics. The detector circuit can store energy associated with the magnetic field emissions and the alerting circuit can provide an audible and/or visual alert using the stored energy. Optionally, the card protection device may be integrated with other smartcard communication functions and/or it may share components with a contactless smartcard.</p> |
