Cipher 20: Ulam

It’s difficult to believe that this is the twentieth cp4space cipher. Anyhow, here it is:



This entry was posted in Ciphers. Bookmark the permalink.

0 Responses to Cipher 20: Ulam

  1. Stuart Gascoigne says:

    I just wanted to thank you for devising the ciphers and, as a relative latecomer to solving them, thank you especially for not subsequently posting any spoilers!

Leave a Reply