The Department of Foreign Affairs has reviewed its computer security systems following the WikiLeaks saga to ensure classified documents are kept safe.

The whistleblower website has published several diplomatic cables from the US embassy in Canberra.

DFAT secretary Dennis Richardson has told a Senate estimates hearing that he is satisfied such a breach would not happen to the Australian Government.

"The breach in the US system - it beggars belief how they even had the arrangement they had," he said.

"In terms of the way our classified systems are set up, it would be very difficult to copy what happened in the WikiLeaks case."

In some of the leaks published last year, it was reported that Foreign Minister Kevin Rudd had suggested force may be needed if China could not be successfully integrated into the international community.

According to a US diplomatic cable released in December, Mr Rudd made the comments during a conversation with US secretary of state Hillary Clinton in March 2009 while he was still prime minister.

The document was the first to be released by WikiLeaks with a significant mention of Australia.

According to the confidential cable Ms Clinton asked for Mr Rudd's advice on dealing with the growing power of China, asking him: "How do you deal toughly with your banker?"

He responded by saying he was a "brutal realist on China".

He said China should be integrated into the international community but that countries should be prepared to "deploy force if everything goes wrong".

The Government has continually said it would not comment on the detail of leaked US diplomatic cables.