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Article About a Secret Communication Channel in 1980's South Africa

This should be of interest to the list.
I must credit the find to Schneier's blog: 

"Talking to Vula <http://www.anc.org.za/show.php?id=4693>" 
(http://www.anc.org.za/show.php?id=4693) 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.
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