Browse Prior Art Database

Credit Card Verification

IP.com Disclosure Number: IPCOM000078374D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Goldwasser, EP: AUTHOR

Abstract

This system provides a quick, inexpensive and secure means for verifying that the presenter is entitled to use a credit card.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

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Credit Card Verification

This system provides a quick, inexpensive and secure means for verifying that the presenter is entitled to use a credit card.

Each card is encoded with a unique multidigit number. The number is derived by multiplying three or four prime numbers, each of which is in the range of five or seven digits. When the card is issued, the holder is given one of the primes of the multidigit number. The terminal which accepts the card allows the holder to key in the prime number. The terminal then divides the multidigit number on the card by the prime number and checks for a zero remainder.

For example, the multidigit number: 1,296,388,991 is a product of the prime numbers: 48,523 and 26,717. The holder of the card would be given one of these two primes. The utility of this technique is based on the fact that the prime numbers of a number are quite difficult to derive.

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