Many of the organizations connected with anarchist violence in London number hackers in their ranks. Another threat is from hostile governments. The US defence department believes 120 countries pose a serious threat to cyber-security. They include Libya, Iraq, Croatia and Serbia. The Chinese are thought to have created military regiments dedicated to cyber-warfare.
Many experts also say the security agencies are looking in the wrong place.
A supervirus is more likely to be the brainchild of a spotty adolescent than some terrorist mastermind.