EP0397512A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for preventing the unauthorized/illegal use of card-type information medium
Assignee: NIHON CARD TRANSFER CORP
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Filing: 1990-05-11
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Granted: —
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Expires: 2010-05-11
Abstract
Abstract Discrete identification data is registered in a card-type information medium, and stored in advance in a host computer connected with a reader/writer of said medium, for processing data in accordance with an object of said medium. When the medium is used, the data including said identification data is read by the reader/writer and are transmitted to the host computer, which then compares the transmitted identification data with that stored therein, and if both data coincide, initiates a predetermined procedure. Subsequently, when the procedure is finished, the host computer alters at least a protion of the identification data erases the identification data prior to alteration and stores the altered identification data therein. The reader/writer also rewirtes the identification data registered in medium by the altered identification data. The rewriting of the identification data is performed whenever the medium is used.
Inventors
- 👤 Keinosuke Isono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G06; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/347; G07F7/10; G07F7/1025; G07F7/1075; G07F7/12; G07F7/122
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
182 words
A method for preventing the unauthorized/illegal use of a card-type information medium comprising the steps of: registering discrete identification data in each card-type information medium from which data can be read and on which data can be written, storing in advance said identification data in a host computer connected with a reader/writer of said information medium via a communication line, for processing data in line with an object of said information medium, reading said identification data from said information medium by means of said reader/writer when said information medium is used, to transmit said identification data to said host computer, comparing in said host computer said transmitted identification data with identification data stored therein, and if both data coincide, initiating in said host computer, a predetermined procedure in accordance with said object of said information medium, altering at least a portion of said identification data, storing said altered identification data in said host computer in place of said identification data as new identification data, and rewriting by said reader/writer, said identification data stored in said information medium by said new identification data.
Claim 2
Independent Claim
182 words
A method for preventing the unauthorized/illegal use of a card-type information medium comprising the steps of: registering discrete identification data in each card-type information medium from which data can be read and on which data can be written, storing in advance said identification data in a host computer connected with a reader/writer of said information medium via a communication line, for processing data in line with an object of said information medium, reading said identification data from said information medium by means of said reader/writer when said information medium is used, to transmit said identification data to said host computer, comparing in said host computer said transmitted identification data with identification data stored therein, and if both data coincide, initiating in said host computer, a predetermined procedure in accordance with said object of said information medium, altering at least a portion of said identification data, storing said altered identification data in said host computer in place of said identification data as new identification data, and rewriting by said reader/writer, said identification data stored in said information medium by said new identification data.
Claim 3
Dependent Claim
35 words
A method according to Claim 1, wherein the alteration of at least a portion of said identification data is implemented by said host computer, said host computer transmitting said altered identification data to said reader/writer.
Claim 4
Dependent Claim
34 words
A method according to Claim 1, wherein the alteration of at least a portion of said identification data is implemented by said reader/writer, said reader/writer transmitting said altered identification data to said host computer.
Claim 5
Independent Claim
20 words
A method according to any one of claims 1 - 3, wherein said identification data include at least unalterable data.
Claim 6
Independent Claim
39 words
A method according to any one of claims 1 - 4, wherein when the alteration of said identification data is implemented, at least a part of said portion of said identification data to be altered is selected at random.
Claim 7
Independent Claim
42 words
A method according to any one of claims 1 - 5, wherein when the alteration of said identification data is implemented, data on at least a part of said portion of said identification data to be altered is selected by random sampling.
Claim 8
Independent Claim
61 words
A method according to any one of claims 1 - 6, wherein data indicating the limit of the amount of value up to which said information medium can be used, is recorded in said information medium, and at least a part of said portion of said identification data to be altered correspond to at least of a portion of said limit.
Claim 9
Independent Claim
53 words
A method according to any one of Claims 1 - 7, wherein a password is recorded in said host computer or said reader/writer, and when said information medium is used, if a user inputs said password into said reader/writer, said host computer or said reader/writer compares said inputted password with said recorded password.
Claim 10
Dependent Claim
16 words
A method according to claim 8, wherein said password is not recorded in said information medium.
Claim 11
Independent Claim
19 words
A method according to any one of Claims 1 - 9, wherein said information medium is a prepaid card.
Claim 12
Independent Claim
19 words
A method according to any one of Claims 1 - 10, wherein said communication line is a telephone line.
References Cited (Backward Citations)
No citation records indexed.
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