A huge range of security exploits, said to be worth over $2m if sold on the black market, have been leaked online.The tools are said to have been created by the US National Security Agency (NSA), and accompanying documents appear to indicate a possible breach of the Swift global banking system.Such a hack could have enabled the US to covertly monitor financial transactions, researchers said.The files were released by Shadow Brokers, a hacking group that has previously leaked malware.If genuine, it represents perhaps the most significant exposure of NSA files since the Edward Snowden leaks in 2013.On Twitter, Mr Snowden...