Each clue begets new clues until the cipher is solved. The cryptogram reads: “Success in dealing with unknown ciphers is measured by these four things in the order named: perseverance ...

His ciphers would begin with “I” and include ... “When ‘that wasn’t me on the TV show’ popped out during the solve, I jumped out of my chair and said, ‘Holy ...

For 35 years, a cryptic sculpture at CIA headquarters has stumped the world's top code breakers. Now, AI chatbots are ...