Signalling scheme for controlling data encryption device in an electronic fund transaction processing system
US5175766A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1991 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jul 25, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/56
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved method for communicating with a data encryption device is described. In accordance with this invention, a data encryption device adapted for providing encryption functions such as data encryption and decryption may be controlled with an inventive signalling protocol which provides two-way, symmetrical messaging. Data encryption messages are sent to a data encryption device with a message packet which includes a start of message character, a token field, a token dependent data field, a token delimiter and an end of message character. Once the requested data encryption function is performed, a response message is generated wherein the response message mirrors the request message with the exception that the token dependent data comprises data which was processed in accordance with the requested function. The method of the present invention is also adapted for loading key information in the data encryption device as well as communicating system status information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.