Patent US4757543A successfully refreshed from Google Patents.
US4757543A
Expired / Lapsed
US
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Encrypting and decrypting device which stores an algorithm in a memory
Assignee: Toshiba Corp
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Filing: 1986-09-02
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Granted: 1988-07-12
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Expires: 2006-09-02
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. The algorithm used to encrypt the data is stored on an ic card issued to the user and updated periodically. By comparing the journal data with its encrypted data, journal data alteration can be easily detected.
Inventors
- 👤 Masuo Tamada
- 👤 Hitoshi Kokuryo
- 👤 Shinsuke Tamura
- 👤 Hiroshi Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:58
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: 10
Claim 1
Independent Claim
127 words
A data processing terminal device, adapted to be on-line connected to a host computer so that input data are sent to the host computer, the input data being processed by the host computer, and encrypted by an encrypting algorithm which is unknown to a user of the terminal device to produce encrypted journal data, and is returned to the terminal device, comprising: means for receiving the encrypted journal data from the host computer; means for decrypting the received encrypted journal data using a decrypting algorithm unknown to the user of the terminal device; first recording means for recording the received encrypted journal data along with decrypted journal data on a first recording medium; and second recording means for recording the encrypting algorithm on a second recording medium.
Claim 2
Dependent Claim
127 words
A data processing terminal device, adapted to be on-line connected to a host computer so that input data are sent to the host computer, the input data being processed by the host computer, and encrypted by an encrypting algorithm which is unknown to a user of the terminal device to produce encrypted journal data, and is returned to the terminal device, comprising: means for receiving the encrypted journal data from the host computer; means for decrypting the received encrypted journal data using a decrypting algorithm unknown to the user of the terminal device; first recording means for recording the received encrypted journal data along with decrypted journal data on a first recording medium; and second recording means for recording the encrypting algorithm on a second recording medium.
Claim 3
Dependent Claim
61 words
The device according to claim 1, wherein said first recording medium includes a single paper sheet, said first recording means prints said received encrypted journal data and said decrypted journal data on the single paper sheet, and wherein said second recording means includes an IC card with a memory, the encrypting algorithm being stored in said memory of said IC card.
Claim 4
Dependent Claim
51 words
The device according to claim 1, wherein the terminal device is a banking terminal device which encrypts transaction request data and sends the encrypted transaction request data to the host compter, and in which the host computer encrypts the transaction data and sends the encrypted transaction data to the terminal device.
Claim 5
Dependent Claim
90 words
The device according to claim 1, which further comprises: means for inputting said received encrypted journal data and the decrypted journal data recorded on the first recording medium; second decrypting means for decrypting the encoded data input by said inputting means using said encrypting algorithm recorded in the second recording means; and means for determining whether said input decrypted data and the data decrypted by said second decrypting means coincide with each other, thereby detecting an alteration of the encoded data and decoded data recorded on the first recording medium.
Claim 6
Dependent Claim
40 words
The device according to claim 1, wherein said first recording medium which stores the encrypted data and decrypted data is a floppy disk memory, and said second recording medium which stores said encrypting algorithm is memory of an IC card.
Claim 7
Dependent Claim
25 words
The device according to claim 1, in which said encrypting algorithm can be changed at intervals of at least one process of the host computer.
Claim 8
Independent Claim
80 words
A method of processing in a data processing terminal device which is adapted to be on-line and connected to a host computer, comprising the steps of: receiving encrypted journal data from the host computer; decrypting the received journal data using a decrypting algorithm which is unknown to a user of the terminal device; recording the received encrypted journal data along with the decrypted journal data on a first recording medium; and recording the encrypting algorithm on a second recording medium.
Claim 9
Independent Claim
80 words
A method of processing in a data processing terminal device which is adapted to be on-line and connected to a host computer, comprising the steps of: receiving encrypted journal data from the host computer; decrypting the received journal data using a decrypting algorithm which is unknown to a user of the terminal device; recording the received encrypted journal data along with the decrypted journal data on a first recording medium; and recording the encrypting algorithm on a second recording medium.
Claim 10
Dependent Claim
18 words
A method as in claim 7 comprising the further step of changing the encryption key at predetermined intervals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |