Toshiba’s hybrid quantum-safe solution combines Post-Quantum Cryptography (PQC) and Quantum Key Distribution (QKD) to defend against the imminent “Q-day” threat when quantum computers could break RSA and ECC. QKD provides Information-Theoretic Security, immune to current and future computational attacks, while PQC offers software-based agility. The layered “defence-in-depth” approach ensures that even if PQC is compromised, QKD secures key distribution. This crypto-agile system enables tiered deployment—QKD for critical sites, PQC for broader reach—lowering adoption barriers, mitigating system failures, and future-proofing networks against evolving quantum risks.

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