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In Quantum Signature: How I Spy on Terrorists, Traitors and You, former U.S. intelligence technologist Mike Yeagley-a pioneer of “ADINT” (advertising intelligence) who advised JSOC, the Pentagon, and CIA on commercial data surveillance-exposes how everyday mobile apps and ad networks have revolutionized spying through “quantum signatures,” unique digital fingerprints built from phone IDs, precise GPS data, and metadata leaked in real-time bidding auctions. Drawing on his groundbreaking VISR/Locomotive program, Yeagley details high-stakes cases, including tracking Vladimir Putin’s entourage via aides’ devices, monitoring U.S. special operations forces from Fort Bragg to a secret Syrian base in a Lafarge cement factory, terrorist hunts in Aleppo amid ISIS movements, and domestic threats like potential traitors linked to foreign espionage (from industrial sites to rural agricultural networks disguised as pig farmers). Informed by his revelations in WIRED magazine and various interviews, the book warns that this democratized power extends beyond governments to corporations and individuals spying on “you,” while offering privacy defenses in an era where your smartphone unwittingly betrays your every move.