Browse Prior Art Database

Chip Card With External Non-Volatile Erasable and Non-Erasable Storage

IP.com Disclosure Number: IPCOM000061675D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Broockman, EC Double, GP [+details]

Abstract

A small hand-held information card C, such as a smart credit card, (Fig. 1) includes logic (e.g., a microprocessor) and random-access memory circuits 12, and a specularly reflective magnetic stripe 18. Data stored on the magnetic stripe 18 may be encrypted and may be decrypted on the card C using a secret key stored within the card and/or a second secret key held by the card user. A terminal 10 allows power and I/O signals through terminal contacts 13 to card contacts 14. A magneto-optic read/write unit 19 (Fig. 2) connected to terminal 10 communicates with stripe 18. The external erasable and non-erasable information is thus available to the smart card's microprocessor. In operation, card C is inserted into terminal 10 such that terminal contacts 13 are physically and electrically coupled to card contacts 14.