The new cyberarms race is costing nations less money than the nuclear weapons race that began seven decades ago, but its impact on everyday life could be greater.
A key advantage when it comes to defending cyberspace is the ability to know where each programme, email or other piece of internet traffic is coming from.
This requires extensive monitoring, which is becoming more common around the world. And as tracking becomes more widespread and sophisticated, concerns are rising about the free flow of information and the erosion of online privacy.
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