With cyberattacks costing companies billions of dollars, officials are thinking about more aggressive methods, including "hacking back" into an adversary's system to find out what they might be looking for or shutting down an attacker's computer system altogether. Hacking back is illegal and could be considered an act of war, but in 2018, the US failed to sign an agreement rejecting hacking back as a cybersecurity option, despite the potential problems the move could cause.

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