Phone-tapping used to mean a quick click of a mouse to extract the right conversations from computerised exchanges. The rise of Internet telephony is making that approach a thing of the past, according to Christine Evans-Pughe. TO CATCH A Cold War spy, first get a team of M16 and CIA operatives to tunnel under the Russian sector in Berlin and find the central communications cable of Soviet Military Command. Next, send a Post Office engineer down the tunnel to attach phone-tapping circuits, and then wait for the intelligence to flood in. For maintenance problems, contact Post Office Special Investigations, a lab full of M15 scientists designing new bugs and fixing old ones in the basement of the Post Office research headquarters at Dollis Hill, North London.
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