An extra 500 cyber spies will be recruited as part of a $1.35 billion boost to protect the nation's sensitive computer networks and data from an unrelenting wave of cyber attacks which China is suspected of orchestrating.

Prime Minister Scott Morrison will unveil the 10-year funding commitment to enhance cyber security ahead of the release of a crucial Defence Department review that is expected to reaffirm the need to spend hundreds of billions of dollars on re-arming the military, including acquiring 12 submarines because of a deteriorating regional strategic environment.