To prevent fraud, a magnetic card's ID, which may be a stripe ID or security chip, is converted to an encrypted card ID, which is stored on the card and in a database. Information about the card's history is captured, encrypted, and stored on the card and in a database. To validate the card, the magnetic...http://www.google.com.tw/patents/US8123124?utm_source=gb-gplus-share專利 US8123124 - Magnetic stripe card anti-fraud security system
