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New Generation of Nexor Sentinel Extends Guard Family


February 06, 2009, Press Dispensary. Nexor, the company that connects, transforms and protects sensitive information for defence, security and resilience programmes, announces two new additions to its family of high assurance guards.

Nexor Sentinel is the mailguard of choice for operational use by the NATO Maintenance and Supply Agency ( NAMSA). Sentinel protects an organisation by ensuring that any outbound data conforms to the data sharing policy and any inbound data has been suitably checked to prevent entry of inappropriate content that could lead to a downstream denial of service.

Nexor Sentinel 2 is the latest version of the STOP (see footnote 1) - based Sentinel. Available immediately, Sentinel 2 runs on STOP 6.4, which is evaluated to EAL5 by both the NSA (see footnote 2) and CESG (see footnote 3). Sentinel 2 offers optimised performance and a range of new functionality including SNMP monitoring, remote management using SSH, support for S/MIME, multiple simultaneous content types, structured security labels and the ability to use third party content filters.

In parallel, Nexor has developed its first SELinux based guard, Sentinel 3, available in March 2009. Sentinel 3 is an appliance that runs on HP Proliant Servers and mirrors the functionality of Sentinel 2. In building Sentinel 3, Nexor has drawn on the expertise of leading SELinux authority and host of the SELinux open source repository, Tresys Technology, to ensure the robustness of the security policies. SELinux was founded as a development project by NSA.

"The concept of extending the Nexor guard family with different operating systems provides our customers with the choice of an EAL5 or an EAL4 evaluated platform, with a proven application that is already widely deployed and represents significant value for money over competitive offerings,” comments Steve Kingan, CEO.

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Notes for editors
For full details, see the Nexor Sentinel Datasheet


1. STOP is a BAE Systems’ proprietary operating system running on XTS400 hardware.

2. NSA is the US National Security Agency

3. CESG is the UK Communications-Electronics Security Group

About Nexor:

Nexor is a leading provider of information assurance solutions to defence and government agencies. Founded in 1990, Nexor connects, transforms and protects sensitive information to ensure trusted access and secure interoperability. Nexor’s comprehensive portfolio of technology and services is readily tailored to provide a value for money contribution to information assurance programmes.

About Tresys Technology:

Tresys innovates and applies advanced technologies to quickly solve the needs of customers requiring agile responsiveness to security requirements. By leveraging secure open source software, our products and services support the most sensitive security missions around the world. As a result Tresys enjoys a distinct reputation for shifting the way governments and businesses approach security. For more information,

For further information, please contact:
Humphrey Browning, Nexor Limited
Tel: +44 (0) 115 952 0500

Media contacts

Humphrey Browning
Tel: +44 (0) 115 952 0500