Xkeyscore Source — Code Exclusive !full!

Leaked 2014 source code from the NSA's XKeyscore program, disclosed by German broadcasters NDR and WDR, revealed that the agency targeted users searching for privacy tools like Tor and Tails. The surveillance rules specifically flagged visitors to security-focused sites and categorized users of anonymity services as potential extremists. Read the full investigation at NDR.

XKeyscore Source Code Exclusive: Inside the NSA’s Digital Dragnet

The revelation of XKeyscore's inner workings remains one of the most significant moments in the history of modern signals intelligence. Often described as the National Security Agency’s (NSA) private Google, XKeyscore is a distributed system that allows analysts to search through vast quantities of raw internet data captured globally. While the tool's existence was first revealed in 2013 by Edward Snowden, a subsequent rare leak of actual source code snippets in 2014 provided an unprecedented look at how the agency targets specific users and technologies. The Secret Blueprint: What the Leaked Source Code Revealed

In July 2014, German broadcasters NDR and WDR obtained and published excerpts of XKeyscore’s source code, marking the first time the public saw the literal instructions used by NSA computers. Key findings from this code include:

Targeting of Privacy Tools: The code explicitly flagged individuals searching for or downloading privacy-enhancing software like Tor or the Tails operating system. xkeyscore source code exclusive

Labeling Users as "Extremists": In the source code, readers of the Linux Journal—a popular tech publication—were referred to as an "extremist forum".

Tor Bridge Discovery: The system was programmed to track anyone requesting Tor "bridge" information via email, which is often used by people in censored countries to access the open web. Under the Hood: Technical Architecture

XKeyscore is not a single database but a piece of software running on a distributed network of over 700 servers at approximately 150 field sites worldwide. The Intercepthttps://theintercept.com A Look at the Inner Workings of NSA's XKEYSCORE

The Architecture of Omniscience

To understand the scale, we must look at the database schema buried in the source. XKEYSCORE does not use SQL or standard NoSQL. It uses a binary columnar store called DB-XS. The source code includes a header file defining the "Master Index": Leaked 2014 source code from the NSA's XKeyscore

typedef struct 
    uint64_t timestamp;         // 8 bytes
    char source_ip[16];         // IPv6 ready
    char dest_ip[16];
    uint16_t port;
    uint8_t protocol;           // TCP, UDP, ICMP
    char fingerprint[64];       // TLS/SSL handshake hash
    char payload_preview[256];  // First 256 bytes of data
 XS_RECORD;

According to the configuration file (config/xs_global.conf), the system retains "FULL DATA" for 3 days, "SURFACE DATA" (metadata + payload previews) for 30 days, and "META ONLY" for 365 days. However, a commented line in the code (// 5-eyes no deletion policy) suggests that data marked as "Permanent Hold" never actually purges.

The Digital Panopticon: How XKeyscore Sees

To understand the source code is to understand the architecture of modern surveillance. XKeyscore is not a single tool but a federated system of distributed clusters. The source code reveals that its primary function is that of a high-velocity indexer.

According to analyzed configurations, the system is designed to ingest "full take" data—meaning it captures not just metadata (who called whom), but the actual content of communications (what was said).

The source code logic operates on a series of "fingerprints." These are essentially scripts written in C++ and Python that act as digital dragnets. When data packets flow across international cables and pass through NSA collection points, XKeyscore analyzes them against a massive database of selectors. These selectors can be as broad as a language or as specific as a single email address. The Architecture of Omniscience To understand the scale,

One leaked snippet reveals a fingerprint designed to target users of the Tor browser. The logic is simple but effective: if a user accesses a specific Tor directory authority, the system captures their IP address and timestamps it. This highlights a key function of XKeyscore: passive fingerprinting. It waits for a target to make a mistake or reveal a behavior, then logs it for an analyst to review later.

The Black Budget and the Maintenance Logs

Buried in the /doc/ folder of the exclusive leak is a maintenance log. It lists the annual cost to maintain the XKEYSCORE global grid: $1.7 billion USD. It also lists the last reboot time of a server codenamed FORTE-11 located at the Telehouse West data center in London: "Never. Uptime: 2,341 days."

This suggests that the core infrastructure is running modified versions of FreeBSD 8.3—a 13-year-old operating system. The security implications are staggering. The NSA is likely aware of over 150 unpatched kernel exploits in that version, but cannot reboot the server for fear of losing active session data.