Topic

Encrypting data at rest

Applicable to

Secret, Top Secret

History

Priority

required

Sep 2023

HACE is used when encrypting media that contains SECRET or TOP SECRET data.

A minor language change was made to the existing control on encrypting media containing SECRET or TOP SECRET data.

Sep 2022

ASD-approved HACE is used when encrypting media that contains SECRET or TOP SECRET data.

Language associated with ‘High Assurance Cryptographic Equipment’ was amended to ‘ASD-approved High Assurance Cryptographic Equipment’ noting that ASD is the sole authority for approving of cryptographic equipment as High Assurance Cryptographic Equipment.

Dec 2021

HACE is used when encrypting media that contains SECRET or TOP SECRET data.

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 HACE products if they wish to reduce the storage or physical transferrequirements for ICT equipment or media that contains classified information to that of alower classification.

2010

Agencies are required to use HGCE if they wish to reduce the storage or physical transfer requirements forICT equipment or media that contains classified information to an unclassified level.