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Scattered across the world, an elite team of code crackers is working tirelessly to thwart the defining cyber scourge of our time. You’ve probably never heard of them. But if you work for a school, a business, a hospital, or a municipal government, or simply cherish your digital data, you may be painfully familiar with the team’s sworn enemy: ransomware. Again and again, an unlikely band of misfits, mostly self-taught and often struggling to make ends meet, have outwitted the underworld of hackers who lock computer networks and demand huge payments in return for the keys.

In the late 1970s, the National Security Agency still did not officially exist - those in the know referred to it dryly as the No Such Agency. So why, when NSA engineer Charles Gandy filed for a visa to visit Moscow, did the Russian Foreign Ministry assert with confidence that he was a spy? Outsmarting honey traps and encroaching deep enough into enemy territory to perform complicated technical investigations, Gandy accomplished his mission in Russia but discovered more than State and CIA wanted him to know.