Michael Pezzullo,the secretary of the Department of Home Affairs,also indicated police are"closing in"on the the suspected leaker of the documents. Mr Pezzullo lashed out at the disclosure as"completely unacceptable"and said the person should go to jail.
ASIO,the security agency charged with counter-espionage in Australia,told the hearing in Canberra the profession of journalism could be used"nefariously"by foreign intelligence services.
"These foreign intelligence actors seek to exploit vulnerabilities in our legal system in order to harm Australia's security and to recruit individuals who can assist them in their goals,"said ASIO deputy director-general Heather Cook.
"In Australia today,journalism is being used as a cover by foreign intelligence actors. And there is a long history of this worldwide."
The agency noted journalism was a convenient cover for espionage as both occupations rely on access to senior people and sensitive information. Ms Cook said some journalists had reported to ASIO their attempted recruitment by foreign spies.
"In light of this,ASIO has concern about the concept of exemptions for particular classes of people in the community,such as journalists. Broad exemptions for the media and journalists would invite exploitation by foreign intelligence actors and may increase the intelligence threat faced by Australian journalists,"she said.