Distributed Aggregation Protocol: A Standard for Privacy-Preserving Aggregation in MPC
summary
Distributed Aggregation Protocol standardizes running Prio-based VDAFs over the network: two non-colluding aggregators accept secret-shared client inputs, validate zero-knowledge proofs, and produce private statistical aggregates. Implementations pair DAP with differential privacy and an anonymizing proxy like Oblivious HTTP; ENPA deployed to production in a dozen+ US states in seven months shows it can work but at higher cost, lower flexibility, and longer rollout. IETF standardization is slow and yields a few large bespoke deployments rather than many plug‑and‑play adopters.
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chapters (10)
- 0:00Introduction
- 1:03Problem statement and Prio
- 4:17Distributed Aggregation Protocol
- 7:31IETF standards process
- 12:48Deploying DAP challenges
- 17:44Incentives in privacy tech
- 21:18DAP versus Let's Encrypt
- 23:25Standards vs private deployment
- 25:54Future of privacy-preserving telemetry
- 26:34Q&A
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