Identification card and authentication system therefor
First Claim
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1. An identification card comprising:
- input means having a keyboard for entering secret data unique to a card holder and transaction data;
calculating means for calculating encrypted data as a sales approval number (SAN) by using at least the secret and transaction data entered by said input means in accordance with a predetermined encryption algorithm; and
display means for visually displaying the encrypted data calculated by said calculating means, whereby the card holder and a transaction with the card in a store are authenticated in accordance with said encrypted data.
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Abstract
A card holder inputs personal identification number (PIN'"'"') data as secret data and transaction data (AMT) in an LSI in an identification card through a keyboard. The LSI calculates encrypted data (SAN) in accordance with the input data (PIN'"'"' and AMT). The encrypted data (SAN) is shown by the card holder to a cashier at a point-of-sales (POS) terminal. The POS terminal performs authentication of the card and the card holder in accordance with the encrypted data (SAN).
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Citations
15 Claims
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1. An identification card comprising:
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input means having a keyboard for entering secret data unique to a card holder and transaction data; calculating means for calculating encrypted data as a sales approval number (SAN) by using at least the secret and transaction data entered by said input means in accordance with a predetermined encryption algorithm; and display means for visually displaying the encrypted data calculated by said calculating means, whereby the card holder and a transaction with the card in a store are authenticated in accordance with said encrypted data. - View Dependent Claims (2, 3)
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4. An identification card authenticaition system comprising:
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an identification card means having input means for entering at least predetermined data which includes transaction data, first means for calculating first encrypted data by using said predetermined data including transaction data entered by a card holder in accordance with a predetermined encryption algorithm, and display means for dislaying the first encrypted data; transfer means for transferring at least said first encrypted data displayed on said display means and transaction data to an external device; and an authentication device means including second means for calculating second encrypted data by using data transferred by a transfer means in accordance with a reference enryption algorithm and measn for detecting a coincidence between the second encrypted data calculated by said second calculating means of said authentication device means and the first encrypted data calculated by said first calculating means of said identification card; whereby the card holder and said identification card means are authenticated in accordance with the coincidence detected by said detecting means of said authentication device means. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method for identifiying a card holder comprising the steps of:
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comparing stored secret data unique to a card holder and input secret data entered from an input means provided in a card means, said stored secret data being previously stored in said card means; entering transaction data from saidinput means when said stored secret data and input secret data coincide with each other; calcualating in a first calculating means first encrypted data as a sales approval number (SAN) data in accordance with said entered transaction data and secret data; transmitting from a point of sale to an issuer'"'"'s center first encrypted data obtained from said first calculating means and transaction data; calculating in a second calculating means at said issuer'"'"'s center second encrypted data in accordance with transaction data sent forth from said point of sale and secret data previously stored; comparing said first encrypted data transferred from said point of sale and said second encrypted data obtained from said second calculating means; and transferring a resultant of comparison obtained in the comparing step to said point of sale. - View Dependent Claims (12, 13, 14, 15)
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Specification