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Counterfeit Identification Card Detection System

IP.com Disclosure Number: IPCOM000049547D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Svigals, J: AUTHOR

Abstract

Prior-art identification cards have incorporated electronic circuits and memory for the purpose of identifying the authorized card holder. In order to prevent copying of information stored in such an identification card, this article teaches a "code book" table stored into the protected memory area of each terminal and each identification card. The code book table comprises, for example, ten entries, each having an entry value and a response value. The terminal randomly selects an entry value and sends it to the card. The card logic checks that the received entry value is a valid entry value by matching it with each entry in the code book table. The card then retrieves the response value corresponding to the received entry value and returns it to the terminal.

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Counterfeit Identification Card Detection System

Prior-art identification cards have incorporated electronic circuits and memory for the purpose of identifying the authorized card holder. In order to prevent copying of information stored in such an identification card, this article teaches a "code book" table stored into the protected memory area of each terminal and each identification card. The code book table comprises, for example, ten entries, each having an entry value and a response value. The terminal randomly selects an entry value and sends it to the card. The card logic checks that the received entry value is a valid entry value by matching it with each entry in the code book table. The card then retrieves the response value corresponding to the received entry value and returns it to the terminal. The terminal has the same code book response and can compare the response value received from the terminal for validity. Because the code book table is stored in a protected memory area of the terminal and the identification card, it cannot be read out of the terminal or the card, and therefore cannot be included in a copy of the identification card.

In order to prevent detection of the entry value and the corresponding response value during communication of these values between a terminal and an identification card, each entry and response value is exclusive ORed, bit by bit, with the encryption of the account number. The terminal likewise exclusive ORs the...