Topic

Using diodes

Applicable to

all

History

Priority

must

Mar 2022

Evaluated diodes are used for controlling the data flow of unidirectional gateways between an organisation’s networks and public network infrastructure.

Miscellaneous changes were made to rationale and recommendations throughout the publication to clarify content without changing intent. This included a review from the Guidelines for System Hardening chapter through to the Guidelines for Data Transfers chapter.

Dec 2021

An evaluated diode is used for controlling the data flow of a unidirectional gateway between an organisation’s network and public network infrastructure.

Miscellaneous changes were made to rationale and security controls throughout the publication. This included:

• A review from the Using the Information Security Manual chapter through to the Guidelines for Media chapter.

• Security controls suitable for all audiences have been identified with the ‘All’ applicability marking while additional security controls suitable for just government audiences have been identified with the O, P, S and TS applicability markings.

• Security controls suitable for specific classifications have been amended to include their classification(s) in the wording of the security controls to reduce the reliance on applicability markings to confer suitability.

• Tables in security controls have been converted into prose to allow for inclusion in the SSP annex template and the XML list of security controls.

• The use of ‘official’ and ‘highly classified’ terminology has been replaced with specific classifications to remove ambiguity.

• Security controls relating to high assurance ICT equipment have had their applicability narrowed to ‘S, TS’ reflecting that they are intended for the protection of SECRET and TOP SECRET systems and data.

2017

Agencies must use a Common Criteria-evaluated diode for controlling the data flow ofunidirectional gateways between sensitive or classified networks and public networkinfrastructure.

Control Text Changed. No public explaination.

2015

Agencies must use a Common Criteria–evaluated diode for controlling the data flow ofuni–directional gateways between sensitive or classified networks and public networkinfrastructure.

2010

Agencies must use an EAL2 diode from DSD’s EPL for controlling the data flow of uni-directional gatewaysbetween classified networks and unclassified or public networks.

2008

For controlling the data flow of one-way gateways of different classifications, where the highest classification is PROTECTED or RESTRICTED, agencies should use a diode evaluated to at least an EAL2 assurance level.