Flame virus: who is behind the world's most complicated espionage software? Given the pattern of the Flame infection known so far - Iran, the West Bank, Syria, Egypt - and its technological prowess, Israel has quickly emerged as many commentators' prime suspect. Richard Silverstein, a US-based commentator and critic of the Israeli government, has made widely-shared claims "my senior Israeli source confirms that it is a product of Israeli cyberwarfare experts." The Jerusalem Post thinks Vice President Ya'alon may even have already hinted Israel is behind Flame. As ever with cyber espionage some are also casting suspicious glances towards Beijing and Washington. But its worth remembering that two years after it was discovered, nobody knows for sure who was behind Stuxnet, and as Eugene Kaspersky notes, Flame is a much more complicated problem. Rob Rosenberger, of the computer security debunking website Vmyths.com, meanwhile offers a skeptical take on the debate. But what do you think? Who is most likely to be behind the Flame virus?