Police have pledged to begin naming and shaming technology giants if they fail to help investigators, as law enforcement chiefs launch a fresh push for tougher anti-encryption laws to tackle the scourge of child sexual abuse.

In a move set to reopen a war between government and the tech sector, Federal Police Commissioner Reece Kershaw, AUSTRAC head Nicole Rose and Australian Criminal Intelligence Commission chief Mike Phelan used a joint appearance at the National Press Club to say police were hamstrung by powers not keeping up with technology.