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Jan 8, 2026 · Information Security

One‑Page Guide to BB84: The Quantum‑Secure Key Book Explained

The article explains why classical public‑key and symmetric encryption crumble against quantum computers and how the BB84 quantum key distribution protocol uses photon polarization to generate a provably secure key, detailing the four‑step Alice‑Bob process, error correction, privacy amplification, and common questions about its security.