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QKD vs PQC

Also known as: QKD versus PQC

Physics-based key distribution versus algorithmic quantum-resistant crypto—different deployment models.

Definition

QKD uses quantum channels to establish keys with information-theoretic claims under physical assumptions. PQC uses classical networks with math assumptions believed hard for quantum computers.

Most enterprise scale-out favors PQC/hybrid on existing infrastructure; national guidance often prioritizes PQC for broad IT.

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