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Operation Vula Print E-mail
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Source: Schneier on Security - Posted by Dave Wreski   
Privacy "Talking to Vula" is the story of a 1980s secret communications channel between black South African leaders and others living in exile in the UK. The system used encrypted text encoded into DTMF "touch tones" and transmitted from pay phones. Our next project was one that led to the breakthrough we had been waiting for. We had received a request, as members of the Technical Committee, to find a way for activists to contact each other safely in an urban environment. Ronnie had seen a paging device that could be used between users of walkie-talkies.

Read this full article at Schneier on Security

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