Cloudflare sets out a post-quantum path for privacy-preserving Privacy Pass tokens

The post addresses no specific CVEs and describes a design direction rather than a vulnerability. Privacy Pass still uses classical RSA and elliptic-curve primitives, so a quantum attacker could forge tokens and bypass rate limiting, though the scheme remains unconditionally private against linking token issuance and redemption. Cloudflare◼ notes post-quantum signatures such as ML-DSA-44 (2,420 bytes) are far larger than ECDSA-P256 (64 bytes), so migration will need re-engineering. Defenders should track the MOLE proposal, which hides the issuer via anchor sets and endorsements.

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