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Inside a Firewall Vendor's 5-Year War With the Chinese Hackers Hijacking Its Devices
Sophos went so far as to plant surveillance “implants” on its own devices to catch the hackers at work—and in doing so, revealed a glimpse into China's R&D pipeline of intrusion techniques.
https://www.wired.com/story/sophos-chengdu-china-five-year-hacker-war/