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A Cryptography Engineer's Perspective on Quantum Computing Timelines

words.filippo.io

April 6, 2026

11 min read

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Summary

Recent developments indicate significant progress in the field of cryptographically-relevant quantum computers. This has prompted a shift in urgency regarding the implementation of quantum-resistant cryptography.

Key Takeaways

Google revised its estimates, indicating that breaking 256-bit elliptic curves could be achievable in minutes using fast-clock architectures like superconducting qubits.
A paper from Oratomic suggests that 256-bit elliptic curves can be broken with as few as 10,000 physical qubits, highlighting the increasing feasibility of quantum attacks.
Experts are now predicting that quantum-resistant cryptography needs to be implemented by 2029 due to accelerating advancements in quantum computing technology.
The urgency for migrating to post-quantum cryptosystems is emphasized, as timelines for quantum computing capabilities are progressing faster than previously anticipated.

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Community Sentiment

Mixed

Positives

The deployment of FIPS 203 (ML-KEM) is crucial for securing protocols like TLS and SSH against future quantum threats, highlighting the importance of proactive measures in cryptography.
The potential for offering PQ Encryption Migration as a Service indicates a significant market opportunity for startups, emphasizing the value of integrating post-quantum algorithms into existing technologies.

Concerns

The lengthy process of standardizing HPKE hybrid recipients reflects inefficiencies within the IETF, which could hinder timely advancements in cryptographic protocols.
Concerns about the slow progress towards practical quantum computing devices capable of breaking public key cryptography suggest that the urgency for new standards may be overstated.