Heute gibt es gleich vier ungelöste Verschlüsselungen, deren Lösung teilweise sehnsüchtig erwartet wird. Für die Lösung des einen Kryptogramms ist sogar eine Belohnung ausgesetzt.

Two months ago, US book author A.J. Jacobs showed me the encrypted journal of psychologist Abraham Maslow (1908-1970). My readers did a good job in analyzing this cryptogram. Now, A.J. asks for additional help.

An encrypted diary posted on Reddit last year is still unsolved.

A. J. Jacobs, a successful US author and journalist, has provided me scans of an encrypted journal written by a renowned psychologist. Can a reader break it?

An encrypted diary recently posted on Reddit looks easy to solve, but so far nobody has broken it.

Gerry Haynaly has deciphered the encrypted diary I recently introduced. Here’s how he did it.

Blog reader Christof Rieber has sent me a potential solution of a major crypto mystery: the encrypted passages of Lady Gewndolen’s diary. Is Christof’s deciphering attempt correct?

Ignaz Meyer, a Bavarian teacher and town writer, wrote an encrypted diary. The content of this joural gives interesting insights into the life of a 19th century individual who had a drinking problem and was not very successful in his job.

In the 19th century, a sailor working on the Great Lakes kept an encrypted diary. Can a reader decipher it?

A French magazine article reports on an encrypted diary written by a pedophile priest. The plaintext is not known to me. Can a reader break it?