[Cryptography] Drawing cipher diagrams

[Pierre Abbat]

https://github.com/phma/DaphneCipher.jl
It took me over a week to draw this diagram in the Gimp, using radius-65 
circles because there are 36 integral points on such a circle (and I 
discovered partway through that the 45° points are close to integral). I'm 
thinking of drawing diagrams of Wring and Twistree. It'll take at least three, 
one for each of Wring, Twistree, and their common key schedule. Can you 
suggest programs for drawing such diagrams?

Pierre
-- 
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