The world’s most advanced military powers are using the Internet to spy on their enemies and prepare digital attacks against rogue targets, a leading cyber security expert said on Friday. “When there’s a major cyber incident it’s very difficult to prove most of the time who did it,” said Richard Clarke, former White House adviser on national security and cyber threats. “There are incidents, I think, where governments are involved, doing either reconnaissance or testing out concepts, probing for weaknesses.” Clarke said he suspects Russia and China are the most pervasive users of Internet for intelligence-gathering on suspected enemy states and plotting ways to use the information for military purposes.Full Story