Electronic cashless transaction system
Patent 5539825 Issued on July 23, 1996. Estimated Expiration Date: 
November 21, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 21, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSecure component authentication system Transaction method wherein transaction amount is compared with account balance before ID is entered Databaseless security system Funds transfer system Electronic cash system Smart card validation device and method Patent #: 5379344 InventorsApplicationNo. 345416 filed on 11/21/1994US Classes:705/68, Balancing account235/379, Banking systems379/91.02, At switching station705/75Transaction verificationExaminersPrimary: Cain, DavidAttorney, Agent or FirmInternational ClassH01K 001/00Foreign Application Priority Data1991-09-30 JPAbstractA key control method is for use in an electronic cashless transaction system including at least a bank center, a store transaction terminal and an IC card being used as an electronic cashless transaction medium. The key control method comprises a step of having the bank center generate and code a first parameter for a transmission to the IC card; a step of having the IC card receive and decode the coded first parameter by using the first key, thereby reconstructing the first parameter issued by the bank center, perform a first operation on the first parameter and a password of a holder of the IC card, and store in a first register; a step of having the store transaction terminal send to the IC card a second parameter coded by a second key, when the holder inserts the IC card 11 into the store transaction terminal; a step of having the IC card decode the coded second parameter by using the second key, thereby reconstructing the second parameter received from the store transaction terminal, perform a second operation on the second parameter and the value stored in the first register, store a result of the second operation in the second register; and a step of decoding a value stored in the second register by using a coding session key stored in a memory of the IC card, thereby obtaining a key for an intended authentication.Other References
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