Gearing Up for Q-Day: Securing Cryptography Before Quantum Attacks

Experts warn that a looming Q-day—when quantum computers could break current cryptography—may arrive sooner than expected, spurred by new but not yet verified preprints from Google and a Caltech spinoff. While no quantum computer has proven Shor’s algorithm at scale, the risk of harvest now, decrypt later means urgent migration to post-quantum cryptography (PQC) and building crypto-agility across systems. NIST standards exist, but full adoption will take years, requiring coordinated effort from industry, governments, and researchers; individuals should consider safeguarding or removing long-term sensitive data, and organizations should begin migrating protocols such as TLS and SSH and improving key management while continuing security research.