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China Used 'Mass Surveillance' on Thousands of Americans' Phones, Report Claims On 12/15/20 at 9:59 AM EST Gary Miller, a former vice president of network security at California-based analytics company Mobileum, told The Guardian he had amassed evidence of espionage conducted via "decades-old vulnerabilities" in the global telecommunications system. While not explicitly mentioned in the report, the claims appear to be centered around Signaling System 7 (SS7), a communications protocol that routes calls and data around the world and has long been known to have inherent security weaknesses. Ac...