The "fingerprinting" techniques, if leaked, could be used by private companies or hackers for unauthorized tracking.
: The code identified users who visited the Tor Project website or searched for Tor-related terms. One specific rule targeted users from "non-Five Eyes" countries (nations outside the US, UK, Canada, Australia, and New Zealand) who accessed the Tor directory servers.
Regarding the source code, I must clarify that XKeyscore is a classified tool, and its source code is not publicly available. However, there have been reports and leaks about the tool's capabilities and architecture.
If you want to explore the history, we can look at the like FISA and Section 702 that govern how agencies use these technical platforms. xkeyscore source code exclusive
, allowing a single query to search through data stored in local MySQL databases at network tap points worldwide. Massive Scale
From a pure computer science perspective, XKeyscore is an engineering marvel. It solves the "Big Data" problem at a scale few technology companies have ever achieved, successfully querying petabytes of unstructured distributed data in seconds.
Unlike systems that query archival data, XKeyscore analyzes data as it passes through . The "fingerprinting" techniques, if leaked, could be used
Anomalous browsing habits, such as visiting a specific combination of websites within a designated time window. The Storage Problem and the Logic of Extraction
A 2014 investigation by Tagesschau and NDR, based on leaked source code, revealed that the NSA's XKeyscore program specifically targeted users of privacy tools like Tor and Tails. The report highlighted that the NSA monitored individuals, including German student Sebastian Hahn, who operated anonymity servers [1].
Strips away network headers to isolate web traffic. It parses cookie values, extracts browser user-agent strings, isolates search queries, and logs visited URLs. Regarding the source code, I must clarify that
A major technical revelation within the source code is how the NSA solves the problem of data gravity. Storing every petabyte of global internet traffic indefinitely is logistically impossible.
The 2014 XKEYSCORE source code leak permanently changed the debate on digital privacy. It provided the technical evidence needed to move the conversation from theoretical threats to concrete surveillance mechanics. Although the code revealed NSA targeting of anonymity tools, it did not fully "break" Tor. The Tor Project responded that the leaked rules primarily targeted public directory services, which were not designed to be hidden, and that properly configured private bridges or VPN over Tor strategies remained largely resistant.
One of the most revealing aspects of the code is its explicit targeting of anonymity tools. The system contains specific rules to identify users searching for or utilizing the Tor network, the Tails operating system, or secure VPN providers.
An analyst enters a "selector" (like an email address or IP). If the data is still within the rolling 3–5 day window, the system can pull the full content (emails, chats, browsing history) from the local node's buffer. 4. Key Capabilities Revealed in Leaks Retrospective Searching: Because the system buffers
I pulled the USB drive. The screen went black for a second, reflecting my own face back at me. I wondered, idly, if my IP address had just been flagged.