Cloudflare has outlined a research design for post-quantum private authorisation called MOLE, short for Moderation of unLinkable Endorsements. The aim is to let a client prove that it received an endorsement from one of a set of trusted issuers without revealing which issuer was involved. Cloudflare sees the approach as relevant to moderating automated and agentic traffic without forcing every interaction into an identity-revealing account model.
The work starts from a limitation in Privacy Pass. Its tokens protect the link between issuance and redemption, but the classical cryptography can eventually be forged by a sufficiently capable quantum computer. Moving to post-quantum primitives creates a size problem: Cloudflare notes that an ML-DSA-44 signature is 2,420 bytes compared with 64 bytes for ECDSA-P256. Its proposed VOLE-based endorsement and credential schemes remain research candidates, with costs and security proofs still under development.
Cloudflare reports estimated presentation sizes of 6.5KB for VOLE-IHAT endorsements and 12KB for VOLE-ACT credentials, with operations taking a few milliseconds in its implementation. Those are preliminary engineering estimates, not a deployed standard. The practical takeaway is that post-quantum migration extends beyond TLS. Anonymous credentials, rate limiting and agent authorisation also depend on cryptography that organisations will eventually need to replace without sacrificing privacy or performance.
