Post-Quantum Cryptography- Preparing digital communication for a Q
summary
Estimates show 20 million physical qubits → 4,000 logical qubits can break RSA‑2048 in about eight hours while IBM targets ~1,121 physical qubits for 2023, so a plausible threat appears within 15–20 years. Implementations of quantum‑resistant algorithms are already in open source: Kyber upstream, Dilithium in review inside Botan, plus work on a PQ‑ready TLS 1.3 (ChemTLS) for key exchange and certificates. Migration still needs standards, hardware updates and roughly a 10–15 year rollout.
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