Support of limited write downs through trustworthy predictions in multilevel security of computer network communications
US5692124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1996 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Aug 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2141
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for limited write downs of data from higher security classification users to lower security classification users across computer networks, while preserving the security of classified data at the higher security classification user from covert transmission via acknowledgment messages from the higher user to the lower user. The intended acknowledgment message is released to the lower user when it matches the user content of a predicted acknowledgment message. In TCP/IP interface applications, the acknowledgment messages are IP based data transfer protocols acknowledging the transfer of data from the lower side to the higher side. With IP datagram transfers, deterministic portions are predicted and non-deterministic portions are identified. Where the number of non-deterministic bits exceed a predetermined rate, the acknowledgment message is discarded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.