The Quantum Threat – When Should We Act and What Should We Do?
summary
Quantum computers run Shor's algorithm and can factor RSA-sized keys, creating a real risk of retrospective decryption when recorded traffic is later cracked; forecasts vary (Google CEO cited five to ten years) but timing is uncertain. Two concrete problems are vulnerable algorithms and predictable keys; NIST runs a post-quantum contest begun 2016 that cut 69 candidates to seven finalists. Practical defenses are deploying those new algorithms and using quantum-produced randomness — CQC’s three-qubit randomness protocol is available as a commercial service today.
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