"If the CIA doesn't have capabilities for eavesdropping, it's not doing its job."

Alan Woodward, a security researcher who advises Europol and previously advised UK spy agency GCHQ, said the public should be "encouraged" by the information published.

"Most of the leaked documents are about targeted attacks. This is not about mass surveillance and vacuuming up a haystack of data to search for a needle," he told the BBC.

"They need warrants, they can't just tap in to any phone - it doesn't work like that. One of the reasons people have faith in the security services is that they tend to obey the law, and when they don't it comes out.

"If Wikileaks has the code behind these exploits, it has a responsibility not to publish that. To do so would expose the public to the very real danger of criminals reusing those exploits still working. These were kept in a controlled environment for a reason."