Iran said Saturday that late October or early November would be a good time for nuclear talks with the six world powers, as it claimed it had put paid to Western espionage against its atomic facilities.

"The end of October or early November is a good time for talks between Iran and five-plus-one," Foreign Minister Manouchehr Mottaki said at a news conference with his visiting Cuban counterpart Bruno Rodriguez.

"The exact date, time and what level the talks should be held are being negotiated by both the sides. Once the details are finalised, they will be announced."

Talks between Iran and Britain, China, France, Russia, the United States and Germany have been deadlocked since October 1, 2009, when the two groups met in Geneva.

The talks are aimed at addressing Western suspicions that Iran is seeking to make atomic weapons under the guise of a civilian nuclear programme, a charge Tehran denies.

In Brussels Saturday, a spokesman for the European Union's foreign policy chief Catherine Ashton, who represents the six powers in the nuclear talks with Iran, also said it was not yet known when they would resume.

"We're not in a position to confirm that a date has been set," spokesman Darren Ennis told AFP. "Mrs Ashton is still ready to talk to Iran and is hopeful that this will be possible."

On Friday, German Foreign Minister Guido Westerwelle said Berlin and the International Atomic Energy Agency (IAEA) have detected signs that Iran was ready to talk about its nuclear programme.

"We have not been able so far to detect any substantial changes in the Iranian government's behaviour. However, we are detecting new signals of a readiness to talk," Westerwelle said after meeting IAEA chief Yukiya Amano in Berlin.

"Whether this readiness to talk leads to concrete talks that are hopefully constructive, time will tell. But it seems that these signals are being transmitted. We have both detected this in our respective areas."

Hardline Iranian President Mahmoud Ahmadinejad had banned talks until the middle of September after Tehran was hit with new UN sanctions on June 9.

Iranian officials have regularly insisted that during any talks Tehran would reiterate that its nuclear rights be recognised.

The Islamic republic's atomic chief Ali Akbar Salehi, meanwhile, said Western spying on its nuclear facilities had been thwarted by Tehran ensuring that its physicists and engineers are better looked after.

Salehi said that in the past Western countries had lured Iranian nuclear specialists abroad "with offers of better education or jobs outside Iran," the Fars new agency reported.

"People who fell for it in the past unfortunately leaked information abroad," it quoted him as saying.

"But the (Iranian Atomic Energy) Organisation has been able to gain the trust of its engineers and address their concerns, so they can continue to work in the organisation without any concerns."

This was not the first Iranian admission of Western or Israeli espionage against its nuclear programme. It has arrested several suspected spies in the past, and prosecutors generally seek the death penalty for those convicted.

In November 2008, telecommunications engineer Ali Ashtiari was executed after being found guilty of involvement in a Mossad plot to intercept the communications of Iranian military and nuclear officials.

Last week, Intelligence Minister Heydar Moslehi said several "nuclear spies" working to derail Iran's nuclear programme through cyberspace had been arrested.

His remarks came after reports that the Stuxnet Internet worm was mutating and wreaking havoc on computerised industrial equipment in Iran.

Analysts believe the virus may have been designed to target Iranian nuclear facilities, especially the Russian-built power plant in the southern city of Bushehr.

Salehi said Iran had now ensured that sensitive information about its nuclear programme was not easily accessible.

"In the past, people had easy access to information, but this is no longer true. It is not necessary for everyone to know about everything," he said.

Iran had "full control" over its computer systems, Salehi said, adding that the West was "coming out with new methods daily" to target its atomic programme.

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