Electronic cashless transaction system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5539825
SERIAL NO

08345416

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A 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.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FUJITSU LIMITEDKAWASAKI18047

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiyama, Ryota Kawasaki, JP 55 1904
Hasebe, Takayuki Kawasaki, JP 64 1890

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
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