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About Brain Tennis Brain Tennis Archive Dorothy Denning is professor of computer science at Georgetown University . She has consulted the US government and testified before the US House of Representatives on key escrow technology . John Gilmore says computers are extensions of our minds - and therefore their contents should be able to remain just as private. It's a candid account of how the FBI, working with the NYPD and US Attorney's office, broke the mob in the 1980s, putting the bosses in jail for life. Read it, and you'll understand why the FBI worries about encryption even while telling business to use it to protect against economic espionage.