Donar: Anonymous VoIP over Tor
Talkat 19th USENIX Symposium on Networked Systems Design and Implementation (NSDI '22) · 2022-04-04..04-06·
summary
DONAR is a user-side proxy that spreads traffic over several links by opening multiple Tor circuits, monitors per-link differential one-way delay, and schedules or duplicates UDP packets (alternate piggybacking and a heavier double-send mode) to meet VoIP QoE. Evaluation on default and optimized Tor shows up to 95% interactive 5‑ and 90‑minute calls and the system keeps latency <360 ms for 99% packets in most (≈86%) calls; double-send is needed on unoptimized Tor. Guards preserve anonymity and code is on GitHub.
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chapters (13)
- 0:00Intro
- 0:32Tor's limitations
- 0:55Our system requirements
- 2:05Which Tor configuration should we use?
- 3:44Do onion services meet latency requirements?
- 7:46Link Selection
- 8:50Scheduling Policy: Alternate
- 9:57Scheduling Policy: Double Send
- 10:33Security
- 11:25Evaluation Setup
- 12:00Donar on 2-hop circuits
- 14:30Conclusion
- 14:51The end
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