Reza Najafi told Iran's state TV today that Iranian nuclear negotiators took "precautionary measures" to protect their secrets.
Kaspersky, a cybersecurity firm with close ties to Russian intelligence, said yesterday the malware it uncovered was so sophisticated, it must have been created by a government.
Citing former US intelligence officials, The Wall Street Journal attributed the spying to Israel, which opposes the emerging nuclear deal between Iran and world powers.