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Comment by fortran77 | Hacker News Reader
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fortran77
·
There's always the "cantenna"
https://en.wikipedia.org/wiki/Cantenna
View on HN
ghostDancer
·
Or Enigma Machines:
http://wiki.franklinheath.co.uk/index.php/Enigma/Paper_Enigm...
Reply on news.ycombinator.com