1. Introduction

2. Anonymity tools
2.1. Architecture of Tor network
2.2. Comparison with other anonymization services

3. Tor Research Areas
3.1. Tor Deanonymization
3.2. Tor Path Selection
3.3. Tor Analysis and Performance Improvements

4. Platforms for Tor Research
4.1. Tor Experiments
4.2. Tor Simulations
4.3. Tor's Analysis

5. Discussion
5.2. Survey Findings