Encrypting and decrypting device which stores an algorithm in a memory
US4757543A · kind A · utility
49Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1986 |
| Grant date | Jul 12, 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 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.