EP0219879A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
IC-card system
Assignee: Toshiba Corp
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Filing: 1985-02-07
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Granted: —
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Expires: 2005-02-07
Abstract
Abstract A data processing terminal device is on-line connected to a host computer and records on journal paper journal data obtained as a result of communication with the host computer. Data is encrypted, and encrypted data is exchanged between the terminal device and the host computer. The encrypted journal data is printed together with the normal journal data on the journal paper. By comparing the journal data with its encrypted data, journal data alteration can be easily detected. The encrypted journal data transmitted from the host computer is decrypted in an IC card. The decrypted data is printed on paper, and the modified data of the journal data is written in an IC card.
Inventors
- 👤 Masuo Patent Division K.K. Toshiba Tamada
- 👤 Hitoshi Patent Division K.K. Toshiba Kokuryo
- 👤 Shinsuke Patent Division K.K. Toshiba Tamura
- 👤 Hiroshi Patent Division K.K. Toshiba Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:05
CPC Classifications
G; G07; G07F; G07F9/00; G07F9/08; G06; G06Q; G06Q20/00; G06Q20/30; G06Q20/36; G06Q20/367; G06Q20/38; G06Q20/40; G06Q20/401; G07F7/00; G07F7/08; G07F7/10; G07F7/1016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A data processing terminal device on-line connected to a host computer, comprising: means for recording journal data of communication with said host computer; characterized by further comprising converting means for processing the journal data in accordance with a processing algorithm unknown to a user of the terminal device and converting the journal data to modified data; and means for recording the modified data, wherein said converting means comprises means for processing the encrypted journal data used in communication with said host computer in accordance with a predetermined operation.
Claim 2
Dependent Claim
88 words
A data processing terminal device on-line connected to a host computer, comprising: means for recording journal data of communication with said host computer; characterized by further comprising converting means for processing the journal data in accordance with a processing algorithm unknown to a user of the terminal device and converting the journal data to modified data; and means for recording the modified data, wherein said converting means comprises means for processing the encrypted journal data used in communication with said host computer in accordance with a predetermined operation.
Claim 3
Dependent Claim
87 words
A data processing terminal device on-line connected to a host computer, comprising: means for recording journal data of communication with said host computer; characterized by further comprising converting means for processing the journal data in accordance with a processing algorithm unknown to a user of the terminal device and converting the journal data to modified data; and means for recording the modified data, wherein said converting means comprises means for extracting some of the bits of the encrypted journal data used in communication with said host computer.
Claim 4
Dependent Claim
87 words
A data processing terminal device on-line connected to a host computer, comprising: means for recording journal data of communication with said host computer; characterized by further comprising converting means for processing the journal data in accordance with a processing algorithm unknown to a user of the terminal device and converting the journal data to modified data; and means for recording the modified data, wherein said converting means comprises means for extracting some of the bits of the encrypted journal data used in communication with said host computer.
Claim 5
Dependent Claim
39 words
A device according to claim 1, characterized in that said converting means comprises means for processing the encrypted journal data used in communication with said host computer with a predetermined four arithmetic four operation or an exclusive OR operation.
Claim 6
Independent Claim
23 words
A device according to one of claims 1 to 3, characterized in that the modified data is stored in a programmable read-only memory.
Claim 7
Dependent Claim
39 words
A device according to claim 4, characterized in that said programmable read-only memory is arranged in a portable device provided separately from a main unit of said data processing terminal device, the portable device being issued to the user.
Claim 8
Dependent Claim
29 words
A device according to claim 5, characterized in that encryption of-the data in communication with said host computer is performed by an encryption circuit arranged in said portable device.
References Cited (Backward Citations)
No citation records indexed.
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