Abstract: Card including a substrate, at least one biometric data entry device on the substrate to receive biometric data about an individual holding the substrate, a memory component on the substrate and containing biometric data about an individual possessing the card and at least one private key, and a processor configured to compare biometric data received via the biometric data entry device to biometric data contained in the memory component to determine whether they match. When there is a biometric data match, a process requiring use of the private key(s) is initiated for authorized use of the card. A chassis intrusion detector system detects tampering with the card and upon such detection, causes deletion of the private key(s) to thereby prevent unauthorized use of the card.