Weighted Factors for Measuring Anonymity Services: A Case Study on Tor, JonDonym, and I2P

There are many systems that provide anonymity service for the users. Most of these systems work on the separation between the users’ identity and the final destination. The level of anonymity these services provide affected by several factors. Some of these factors are related to the design of the anonymity service itself. Others are related to how the system is used or what is the application/purpose the user wants to run over the anonymity service. In this paper we: (i) propose five factors that aim to measure the anonymity level from the user’s perspective; (ii) evaluate these factors on three anonymity services, namely Tor, JonDonym, and I2P as case studies; and (iii) present a mechanism to evaluate anonymity services based on our factors and measure the level of anonymity. Keywords— Anonymity Factors; Metrics; Tor; JonDonym;