Governments, multinational corporations and global institutions are losing the battle against computer hackers and must combine their resources if they are to lock out cyber intruders, experts say. The International Monetary Fund has joined Sony Corp. and Google Inc. on a growing list of hacking victims but it is hard to identify the culprits who  manage to always keep on technological step ahead of their pursuers, Reuters said. Cyber security experts say the only way to effectively combat the menace is for the public and private sectors to join forces and combine greater regulation with international action. “Clearly, we are losing the battle,” said Vijay Mukhi, one of India’s leading cyber security experts.