Cloudflare studies quantum-proof Privacy Pass as forged tokens could bypass bot checks
shashib · x · 2026-11-10
Cloudflare published research on quantum-proofing Privacy Pass, the anonymous token that lets people and trusted AI agents skip puzzles without being tracked.
- Privacy holds: a quantum attacker still could not link a token to its owner.
- Forgery is the risk: on Q-Day, attackers could mint tokens past rate limits and bot checks.
- Cloudflare targets full post-quantum security by 2029; a quantum-safe blind signature is estimated at 4.3 KB.
- Over 65% of human traffic to Cloudflare is already on post-quantum encryption.
The author advises asking vendors which cryptography sits behind every anonymous token they verify, including for AI agents, and getting a replacement date in writing before signing contracts that run past 2029.
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