Patent ID: 6182891
Filing Date: 2001-02-06
Classification: G06K,G06Q,G07F

Abstract:
An electronic check system for issuing an electronic check of the form of electronic data, comprising:an IC card having an IC chip in which are stored a set money amount and an usable money amount which must be lower than or equal to said set money amount, said usable money amount or defining an upper limit for a face value of a single electronic check which can be issued;a card issue device for writing an initial value of said usable money amount in said IC chip of said IC card; anda payment processing device for inputting a payment amount thereinto and for, only if said payment amount input does not exceed said usable money amount stored in said IC card, accepting the issue of an electronic check having the face value of said payment amount from said IC card and for updating said usable money amount stored in said IC card by subtracting from said usable money amount said face value of said electronic check which has been issued;wherein said IC chip of said IC card imposes a rewrite restriction with respect to said set money amount stored in said IC chip, and maintains said rewrite restriction unless a rewrite authority key which only a payer knows is used.