Two stage read-write method for transaction cards

Details Two stage read-write method for transaction cards Two stage read-write method for transaction cards

1994-02-22

1996-09-24

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

235379, 235380, 235381, G06F 708

Patent

active

055598854

ABSTRACT:
A method for providing convenient, secure access to numerous benefits with a single wallet sized card having a high capacity data storage area, preferably an optical stripe, and a lower capacity magnetic storage stripe. The high capacity area is indelibly written with data denoting a set of entitlements and records of the owner of the card. To obtain use of the entitlements, the owner takes the card to a data conversion terminal and selects a set of entitlements from a menu displayed at the terminal and, provided that the selected set is a subset of the entitlements indelibly recorded on the high capacity area of the card, data is written on the magnetic stripe of the card authorizing use of the selected entitlements. The data written on the magnetic stripe can be used to obtain benefits at numerous existing and foreseeable magnetic stripe readers. If the selected set of entitlements is not a subset of those indelibly recorded, suggesting that the possessor of the card is not the owner of the card, such writing of data on the magnetic stripe is prevented, denying use of the card to obtain benefits.

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