WikiLeaks founder Julian Assange has vowed to reveal confidential account details of rich and famous individuals after taking delivery of a new dossier from a former Swiss banker.

Whistleblower Rudolf Elmer, who handed over two CDs to Mr Assange in London, said he wanted to expose mass tax evasion before he flies back to Switzerland to stand trial accused of stealing information from a bank.

Although he has not named those involved, he claims the CDs contain information about 40 politicians along with business people, multinational conglomerates and figures from the art world.

At the Frontline Club in London, Mr Elmer gave Mr Assange the CDs, which he said contained bank account details of "high net worth" individuals and businesses. He said those named in the documents are from Britain, the US, Germany, Austria, Asia and "all over".

Mr Elmer, a former executive at Julius Baer Bank, said he was releasing the information to educate society.

"I do think, as a banker, I have the right to stand up if something is wrong," he said.

"I am against the system. I know how the system works and I know the day-to-day business. From that point of view, I wanted to let society know what I know. It is damaging our society."

Mr Assange, whose whistleblowing website is still working through a leaked cache of about 250,000 diplomatic memos, praised the ex-banker's attempts to expose alleged shady practices in the financial industry.

The Australian, who is currently fighting extradition to Sweden where he faces sex offence allegations, said the names could be published on the WikiLeaks website in two weeks, once they have been verified.