Secret identification number checking system
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United States of America Patent
Stats
-
Nov 30, 1993
Grant Date -
N/A
app pub date -
Apr 12, 1992
filing date -
Oct 18, 1988
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention relates to a secret identification number checking system for comparing a secret identification number stored in a magnetic card (11) and a secret identification number entered by the bearer of the magnetic card. Data to enable the comparison is stored in a card medium (13), and the card medium (13) and a transaction machine (17) mutually authenticate each other. When if both the card medium (13) and the transaction machine (17) are legitimate, the card medium (13) sends the data to the transaction machine (17) to permit the secret identification number stored in the magnetic card (11) to be compared with the secret identification number entered by the bearer of the magnetic card. The secret identification number checking system thus improves the security of transactions.
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