July 21 (Reuters) - Chinese hacking teams have been blamed by Western intelligence agencies and cybersecurity groups for digital intrusion campaigns across the world, targeting everything from government and military organisations to corporations and media groups. Cybersecurity firms believe many of those groups are backed by China's government. China's authorities have consistently denied any form of state-sponsored hacking, saying China itself is a frequent target of cyberattacks. Beijing has called the U.S. "the empire of hacking." Some of the Chinese hacking teams recently identified are: STORM-0558 Chinese hackers have since May secretly accessed email accounts at around 25 organisations, including...