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For six years, Sophos fought a secret cyber war against a state-backed hacking group targeting its firewalls. This forced Sophos to drastically change tactics to properly secure their firewalls. Was it ethical? Was it effective? They disrupted nine zero-day attacks, exposed who was hacking them, and forced the hackers to change tactics. But at what cost? You have to listen to one of the most audacious corporate cyber defenses ever conducted.