A card-enabled processing system comprises a security module for securely exchanging data with cards, such as smart cards, and an application module for processing data from the smart cards. The security module encrypts and decrypts data using keys, which are securely stored in a secure memory. The security...http://www.google.com.hk/patents/US5923759?utm_source=gb-gplus-share專利 US5923759 - System for securely exchanging data with smart cards
