After a hiatus of two years, the Chaocipher Clearing House has uploaded a new progress report (#25) summarizing Chaocipher research and activity since January 2015 -- a lot has happened since then. The report summarizes the Chaocipher challenges that have both been solved and that remain to be solved (here's a challenge for you cryptanalytic buffs!). In fact, Chaocipher is slowing growing virally, already becoming the source of wall posters (yup!).
The Chaocipher Clearing House
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