Privacy Impact Assessment of Tor Monitoring Tools

This document is a privacy impact report that outlines the results of a whitebox privacy impact review conducted on several Tor Monitoring Tools. The assessment was commissioned by the Tor Project and executed by 7ASecurity in August 2024. The audit involved a thorough evaluation of the privacy implications associated with tools such as TagTor, DescriptorParser, Margot, Exitmap, and Bermuda. The methodology included a comprehensive review of documentation, source code, and dynamic analysis to identify potential privacy concerns. The report details findings related to each tool, including the absence of significant privacy issues in most cases, while also noting areas for improvement in anonymization techniques. The document concludes with a summary of the overall privacy posture of the tools assessed, emphasizing that the tools generally adhere to strong privacy practices. The report serves as a foundational assessment, with the expectation that future iterations will build upon these findings to enhance privacy protections further.