PACT: Anonymous Credentials for the Web
Summary
The Mozilla Hacks article introduces PACT, a privacy-preserving framework for web access control using anonymous credentials. It explains the limitations of bot detection, device attestation, and CAPTCHAs, and proposes an open ecosystem with Anchors, Endorsements, Moderators, and Credentials to rate-limit users while preserving privacy. It covers cryptographic foundations (Privacy Pass, zero-knowledge techniques, MPC) and discusses deployment challenges and next steps with IETF and W3C collaboration.