Date: Tue, 1 Feb 1994 20:21:46 -0500 [...] HIGH-TECH SNOOP GADGET. A super-secret branch of the Canadian Security Intelligence Service has awarded three contracts to a Montreal firm to make equipment that can quickly isolate key words and phrases from millions of airborne phone, fax, radio signals and other transmissions. The hardware has the "Orwellian potential to sweep through ... and keep records of all conversations," said one CSIS critic. (CTV National News, 01/31/94 11:00 pm).
Dunno how feasible this kind of keyword recognition presently is, but here's another reason to encrypt.
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Eli ebrandt@jarthur.claremont.edu