Data processing terminal device which stores a modified decrypted data in a programmable read only memory in order to detect alteration thereof
US4771460A · kind A · utility
38Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Sep 2, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/1016
- WIPO fieldControl
- WIPO sectorInstruments
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 received by the terminal is decrypted and printed on a journal paper, then modified and stored in a PROM. By comparing the journal data with the modified data, journal data alteration can be easily detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.