NEW YORK—Wall Street often guards its high-frequency trading strategies as if they were matters of national security. Yet the worlds of the quants and the spymasters share more than a penchant for secrecy.
The defense and intelligence fields have long relied on computers to help collect and organize data. But a new cross-pollination has flowered with the super-fast automated systems developed by Wall Street. That technology is now being used to search the Internet's message boards for security threats, comb through bank records for unusual flows of money and gather information used in combat in Afghanistan and Iraq.
Just as ...
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