Browse Prior Art Database

PIN Check Control for Transaction Terminal

IP.com Disclosure Number: IPCOM000060564D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue

IBM

Related People

Authors:
Kawai, S [+details]

Abstract

This article relates to a customer identification system for transaction terminals in which a PIN (personal identification number) manually entered by a customer at a terminal is checked for coincidence with a PIN previously registered for that customer. If no-coincidence is detected, then the total number N of the no-coincidence checking is recorded on the customer's cash card to make it detectable when the number reaches a predetermined value K for making the card invalid for further transactions. The present invention makes it possible for the card recorded with the value K for the non-coincidence number to be used for further transactions only when the PIN coincidence is confirmed in two subsequent successive checks.