Does anyone have any hard ciphers to be cracked for fun? The title says it all. Do you have any ciphers or encoded messages that you could post as a brainteaser?
Thanks!
Not sure anyone here has a sense of humour.  But in case they do:-

Obviously Kryptos, CIA headquarters, Langley.

Less obviously, this sad one time pad message, Surrey, England (also proving that OTPs did exist and were useful).


Good luck, and please post your answers here :-(