Australian intelligence officials have concluded that the breach of the Federal Parliament network in February was carried out by China, but has kept it quiet to avoid any problems in the bilateral trade relationship, a report claims.

The Coalition Government will pledge $156 million to bolster cyber security efforts that are in place to guard the country's communications networks, with Prime Minister Scott Morrison set to make the pledge on Monday.

The Australian Signals Directorate has ascertained that hackers who breached the networks of the Australian Parliament and those of three main political parties — Liberal, Labor and National — are nation-state actors, but the agency's director-general, Mike Burgess, has said he cannot name the country involved in a public forum.