Security measures or tactics designed to oppose, undermine, or protect against other security threats.
From counter- (against, opposite) + security (from Latin securitas, freedom from care). The prefix counter- became common in English during the 16th century to describe opposing actions or reactions.
This word shows how security itself becomes a moving target—as threats evolve, so do counter-threats. It's like an arms race where each side develops measures against the other's measures.
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