ASIO T4 Protective Security

T4 provides protective security advice for Australian Government agencies. With the written approval of the Attorney-General, T4 can provide such services to state and territory governments, business enterprises and critical infrastructure owners, provided that a Commonwealth interest can be shown.

Protective Security Advice

ASIO-T4 provides an ongoing specific advisory service for Government clients, on how best to protect their people, information and physical assets. This advice is tailored to address individual and specific requirements.

Advice may include perimeter security, access control measures, CCTV, alarm systems, locks and other door hardware, advice on the construction of new buildings, security zone construction, guarding arrangements, security audits and administrative and personnel security.

ASIO-T4 also assists State and Territory governments and law enforcement agencies that provide counter-terrorism protective security advice to state and territory critical infrastructure.

Certification of Zone 5 Facilities

ASIO-T4 is the certification authority, nominated in the Australian Government PSPF, for the physical security certification of all facilities/zones where the compromise, loss of integrity or unavailability of the information would have a catastrophic business impact level. This includes facilities/zones holding and/or discussing Top Secret security classified information and facilities/zones that have a large aggregation of information at lower classifications. Re-certification is required at least every five years. Early consultation with ASIO-T4 is recommended to ensure new facilities have the appropriate level of security built in from the design stage.

Technical Surveillance Counter Measures (TSCM)

ASIO-T4 offers technical surveillance countermeasures (TSCM) assistance to Australian Government departments and agencies to provide a level of assurance that highly classified or sensitive discussions and information are not subject to compromise through technical means – for example, through covert listening devices.

TSCM inspections are an important element of an appropriate protective security environment and must be supported by physical and procedural measures to ensure the integrity of an inspected area is maintained.


ASIO-T4 has developed a range of publications to assist in the application of the Protective Security Policy Framework.

  • ASIO Technical Notes – are minimum guidelines for developing security zones in line with the PSPF.
  • Security Equipment Guides – assist agencies when procuring a range of lower level security products. They contain advice on the selection and application of security products, including reference to Australian standards, best security practices, limitations of their use etc.
  • Protective Security Circulars – highlight current protective security issues and short to long term mitigations if applicable.

Publications are available from ASIO-T4 or on the Protective Security Policy community on GovTeams (access to the PSP community is for government personnel only - to gain access please contact the Attorney-General's Department at

ASIO-T4 has released a range of guides to assist security managers in protecting their people, property, assets and information. For example:

  • Protective security mangers handbook: Introduction to protective security measures.
  • Security manager guide: working from home
  • Security manager guide: precinct security
  • Security manager guide: critical infrastructure security.

These publications are available from ASIO-T4, or are accessible by subscribers to ASIO's Outreach website.