A cryptogram that was found on the wall of a tunnel at the University of Texas has been discussed on several websites for years. Can a reader of this blog finally find the solution?

My readers have shown that a Playfair cryptogram consisting of only 50 letters can be broken. Here’s a Playfair challenge with only 40 letters. Can you break it, too?

I have an appearance in a YouTube video that introduces the ten most notable unsolved cryptograms. More than a million people have already watched it.

Canadian artist Zen Rankin has published two encrypted messages he created in his youth days. Can a reader break them?

An alleged cryptanalyst has published a new hypothesis about the Somerton Man cryptogram on Wikipedia. Does it make sense?