First

a router selecting based algorithm on location diversity and RTT was proposed; then a hierarchical location-diversity-based low-delay anonymous communication framework was presented.The framework’s security was analyzed and an evaluation algorithm for security was presented. In the end

a simulation experiment and result analysis was given. The theoretic analysis and simulation experiment indicate that the HLLACF based on the mechanism can prevent AS-level passive attack and other familiar attacks well while decreasing commnunicaton delay

and HLLACF also scales well.