Definition

Unlike a normal firewall, a trusted guard is a special type of firewall that is built on a Trusted System?. In fact, every element of it must meet those requirements. Trusted guards are also different from normal firewalls in that they are designed to enforce Mandatory Access Controls? on network traffic, data, files and other objects. This is accomplished through application level proxies and Data Labeling?, wherein all data moving from one domain to another through the firewall is labeled with a specific classification, and is not allowed to move into a lower level of classifiction without prior authority. This is also referred to as moving from the high-guard to the low-guard side, which would be attempting to move top secret data into an area that was not cleared for top secret data. Trusted Guards are used in classified environments primarily, but may also be used in non-government environments where data security requirements may be more stringent.

Examples

Norman Firewall (cache)

ISSE Guard (cache)

http://www.trustedcs.com/products/1products1_3_2.html (cache)

http://www.trustedcs.com/products/1products1_3_3.html (cache)