HLLACF: A Hierarchical Location-Diversity-Based Low-Delay Anonymous Communication Framework

In order to improve the communication speed, low-delay anonymous communication systems, such as Tor, prefer high performance router when selecting routers. This choice makes routers´ selection being local. This paper first proposes router selecting algorithm based on location diversity and RTT; then a hierarchical location-diversity-based low-delay anonymous communication framework is presented. This framework´s security is analyzed and a simulation experiment and result analysis is given. The theoretic analysis and simulation experiment indicate that the HLLACF can prevent AS-Level passive attack and other similar attacks well while decreasing communication delay and HLLACF also scales well.