Failsafe security system and method
US5995628A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Apr 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/32
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Controllable functions (210, 220, 230) and controllable connection managers (212, 222, 216, 226) are used to provide a fail-safe security system implemented on a single processor (200). Red subsystems, black subsystems and clear bypass subsystems ensure separation between red data and black data. Connection managers (212, 222, 216, 226) are used to isolate and control red data ports (214), black data ports (224), red crypto ports (218), and black crypto ports (228). Subsystems are configured to control data flow, provide data separation, access control and prevent single failures from compromising security system (200). Each subsystem is managed separately, and each subsystem has unique access protection provided by controller (202). Within security system (200), the subsystems are kept separate. Functional separation of the red data memory and black data memory is maintained to provide fail-safe data isolation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.