The Navy's experts didn't believe that China was capable of reverse-engineering the plane's N.S.A.-supplied operating system, estimated at between thirty and fifty million lines of computer code, according to a former senior intelligence official. Mastering it would give China a road map for decrypting the Navy's classified intelligence and operational data. "If the operating system was controlling what you'd expect on an intelligence aircraft, it would have a bunch of drivers to capture radar and telemetry," Whitfield Diffie, a pioneer in the field of encryption, said. "The plane was configured for what it wants to snoop, and the Chinese would want to know what we wanted to know about them—what we could intercept and they could not." And over the next few years the U.S. intelligence community began to "read the tells" that China had access to sensitive traffic.
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