Topic

Diodes for particularly important networks

Applicable to

Secret, Top Secret

History

Priority

must

Dec 2021

Removed

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.

2015

Agencies must use a Common Criteria–evaluated diode between an AUSTEO or AGAO networkand a foreign network at the same classification.

2010

Agencies must use an EAL4 diode from DSD’s EPL between an AUSTEO or AGAO network and a foreignnetwork at the same classification.

2008

Agencies must use a diode of at least an EAL4 assurance level between an AUSTEO or AGAO network and a foreign network in addition to the minimum assurance levels for diodes between networks of different classifications.