William Caldwell

Herd: A Scalable, Traffic Analysis Resistant Anonymity Network for VoIP Systems

Stevens Le Blond, David Choffnes, William Caldwell, Peter Druschel, Nicholas Merritt
Appears in: 
CCR August 2015

Effectively anonymizing Voice-over-IP (VoIP) calls requires a scalable anonymity network that is resilient to traffic analysis and has sufficiently low delay for high-quality voice calls. The popular Tor anonymity network, for instance, is not designed for the former and cannot typically achieve the latter. In this paper, we present the design, implementation, and experimental evaluation of Herd, an anonymity network where a set of dedicated, fully interconnected cloud-based proxies yield suitably low-delay circuits, while untrusted superpeers add scalability.

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