Policy, privacy and post-quantum: anonymous credentials for everyone

This post introduces the concept of Anonymous Credentials (ACs) and their application to privacy-preserving rate-limiting for AI agentic platforms and users. It details the requirements for ACs, including blind signatures, nullifiers, and public attributes, and discusses the challenges of migrating to post-quantum (PQ) cryptography for these primitives. The post highlights the current state of classical AC adoption in initiatives like the EU's digital identity wallet and ongoing IETF efforts, while also outlining the need for PQ-unlinkable and unforgeable ACs to address future threats.