Collaery secrecy 'unfounded', says defence

Bernard Collaery argues that keeping a judgment secret on national security grounds is unfounded. (AAP)

Defence lawyers for prosecuted whistleblower Bernard Collaery have told Australia's highest court a push to keep a court judgment secret on national security grounds is unfounded.

The attorney-general's department argues the release of the unredacted document would have grave implications for Australia's national security.