Practical Anonymity for the Masses with MorphMix

MorphMix is a peer-to-peer circuit-based mix network to provide practical anonymous low-latency Internet access for millions of users. The basic ideas of MorphMix have been published before; this paper focuses on solving open problems and giving an analysis of the resistance to attacks and the performance it offers assuming realistic scenarios with very many users. We demonstrate that MorphMix scales very well and can support as many nodes as there are public IP addresses. In addition, we show that MorphMix is indeed practical because it provides good resistance from long-term profiling and offers acceptable performance despite the heterogeneity of the nodes and the fact that nodes can join or leave the system at any time.