Border Protection Command provides security for Australia's offshore maritime areas.

http://www.bpc.gov.au...

http://www.bpc.gov.au/

The Defence Intelligence Organisation (DIO) is an intelligence assessment agency that provides services and advice which support Defence and Government decision-making and assist with the planning and conduct of Australian Defence Force operations. DIO is responsible for assessing military intelligence that focuses on global security activity, terrorism, defence economics, military capabilities, and science and technology that has military applications.

http://www.defence.gov.au...

http://www.defence.gov.au/dio/

Provides information about securing Australia's borders, entry requirements for travelling to Australia and how the department prevents illegal entry into Australia.

http://www.immi.gov.au...

http://www.immi.gov.au/managing-australias-borders/

The Australian Customs and Border Protection Service manages the security and integrity of the Australian border and assists people and cargo to move in and out of the country.

http://www.customs.gov.au...

http://www.customs.gov.au/site/page5799.asp