Beijing: As the Chinese government rejects claims it is behind the cyber attack on the Australian Parliament, Chinese research shows China is the world's biggest target of cyber attacks.

Beijing security firm Knownsec Information Technology reported on Monday that Chinese organisations suffered an average of 800 million cyber attacks daily in 2018, hitting a peak of 4.9 billion a day in August.

The Liberal, Labor and National parties have been hit by a sophisticated cyber attack. Credit:

Most (97 per cent) were by domestic hackers, but a growing percentage came from overseas, the report said.

Tens of millions of attacks each day came from the US, South Korea and Japan with government and financial websites more likely to be targets.