Although XKEYSCORE's codename had surfaced in job postings and online résumés earlier, its full capabilities were first exposed in July 2013 by NSA whistleblower Edward Snowden. Working alongside journalist Glenn Greenwald, Snowden revealed that XKEYSCORE enabled "almost unlimited surveillance of anyone anywhere in the world". This system could intercept emails, website visits, online searches, and social media interactions on a global scale.
That line contradicted every public statement the NSA had made. The public claim was that they targeted specific individuals. The code revealed they targeted behaviors . If you cared about privacy, you were suspicious by default.
The leaked configuration files show that XKEYSCORE can target users based on behavior rather than identity. Examples of coded rules include flag parameters for: xkeyscore source code exclusive
In one exclusive configuration file,
traffic temporarily, analysts can search for activity that happened they knew a target was interesting. Session Reconstruction: Although XKEYSCORE's codename had surfaced in job postings
due to a misconfigured map file in their npm registry. While unrelated to the NSA, this represents a major contemporary source code exposure in the security landscape. regex rules used by XKeyScore to identify Tor users? XKeyscore and NSA surveillance leaks – expert reaction
On July 3, 2014, German public broadcasters and Westdeutscher Rundfunk (WDR) , in collaboration with the Tor Project and The Intercept , published what they described as "exclusive access to top secret NSA source code". The file, named xkeyscorerules100.txt , was presented by the journalists as authentic source code derived from Snowden’s document trove. This marked the first time operational code of the NSA had entered the public domain. That line contradicted every public statement the NSA
The true technical revelation of the XKeyscore source code lies in its filtering logic, written primarily in C++ and extended through specialized scripting frameworks. The system uses specific rule-based scripts to tag, categorize, and alert handlers to specific user behaviors. Fingerprinting and AppID Rules
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;
The source code for XKeyscore—the National Security Agency’s most pervasive, contentious, and powerful internet surveillance tool—had been the subject of endless congressional hearings and presidential committees. But the hearings dealt in abstractions: "metadata," "collection," "foreign intelligence." They dealt with the idea of the tool.
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