One of the most revealing aspects of the XKeyscore code design is its reliance on "fingerprints." When a target does not use a known email address or phone number, how does the system track them? Device Fingerprinting
Individual sensor sites capture raw network packets (PCAP data) directly from the wire. Because the volume is so massive, this complete packet capture is only retained for three to five days before being overwritten. xkeyscore source code exclusive
Perhaps the most telling aspect of the leaked source code is the library of "App IDs." These are modules designed to parse and interpret specific internet protocols. One of the most revealing aspects of the
As raw data flows through these choke points, specialized hardware splitters clone the optical signals. This ensures that XKeyscore processes a perfect mirror image of global internet traffic without delaying or disrupting the actual user experience. Perhaps the most telling aspect of the leaked
The configuration syntax defines exactly what patterns the processing engine should look for. A rule targeting specific webmail activity might look structurally similar to this:
The source code also reveals specialized extractors for Virtual Private Networks (VPNs). The system parses unencrypted handshake metadata from protocols like PPTP and L2TP to extract real user identities hiding behind the VPN tunnel. The Power of "Full-Take" Fingerprinting
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