How a Patristocrat, a simple substitution cipher without spaces, worksHow to detect a PatristocratHow to break a PatristocratFrequency analysis using digraphsWord guessingSuccess storiesA prison messageThe Cheltenham Number StoneChallengesRudyard Kipling’s encrypted messageNSA’s second Monday ChallengeUnsolved cryptogramsThe Dorabella cryptogramThe Chinese gold bars mysteryJames Hampton’s notebook