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    US security firm links China to vast hacking

    Al Jazeera English

    by Al Jazeera English

    A top secret branch of China's military is being accused of being behind cyber attacks on companies all over the world. An American computer security firm says the group of hackers, also known as Unit 61398, has been operating over the past seven years to steal information. The Chinese government, however, denied their involvement in the global hacking operation reportedly based in Shanghai. Al Jazeera's Gerald Tan reports.