Reply To: The official Challenge 10 tips and hints thread
(Harry, I don’t know if you will be allowed to answer this at this point, but…)
Does the cipher used to encrypt 10B, by any chance, appear in http://www.cipherchallenge.org/wp-content/uploads/2022/09/A-Book-on-Classical-Cryptography-by-Madness.pdf?
{I won’t answer that, but I will post it because it is a good opportunity to advertise the book! Harry]