Spectrum: High-bandwidth Anonymous Broadcast
Talkat 19th USENIX Symposium on Networked Systems Design and Implementation (NSDI '22) · 2022-04-04..04-06·
summary
Spectrum is a deployed system that uses two or more non‑colluding servers, secret sharing, Carter‑Wegman MACs and distributed point functions to let few broadcasters anonymously send large files to many subscribers. The paper claims 4–120,000× faster peak throughput vs prior cryptographic systems, implements the design on commodity servers and demonstrates 1GB in 13h20m with an anonymity set of 10,000 and ~200 bytes extra per user. It prevents malicious clients via blind access control and detects malicious servers with a blame game protocol.
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chapters (10)
- 0:00Introduction
- 0:27Motivation
- 0:53How can whistleblowers publish anonymously
- 1:42Spectrum
- 4:45Blind Message Authentication
- 8:57Multiple Broadcasters
- 11:53Client Elimination
- 13:10Blame Game
- 13:37Comparison
- 14:52Evaluation
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