Harry Houdini (1874-1926), illusionist and pioneer of the skeptics movement, had an interest in ciphers. Can you solve two encrypted telegrams he mentioned in one of his essays?

For ten years, adventurers and puzzle fans have been hunting for a treasure hidden by US millionaire Forrest Fenn. As it seems, a person who wants to stay anonymous has now found it.

Gravestones bearing an encrypted or hidden message are one of my favorite blog topics. Here’s a speciment I recently discovered on Reddit.

In WW2, later US president John F. Kennedy and his crew disappeared after their torpedo boat had sunk. Can my readers help to make sense of an encrypted message that was sent a few days later?

Two years ago, I blogged about a beautiful encrypted postcard sent by a man named Fritz to his lover Leni. A blog reader has now made aware of a similar card from the same sender.

On Reddit I found two messages allegedly left behind by people who committed suicide.

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

Blog readers Richard Bean, Frode Weierud and George Lasry have broken most of the ciphertexts from the Biafran War I recently introduced.

Last week, I introduced a 750-letter ciphertext created with a bigram substitution. Jarl Van Eycke and Louie Helm have now solved this challenge. As far as I know, this is the shortest bigram cipher challenge ever broken.

According to a TV documentary, a German WW2 soldier created encrypted notes describing the location of a hidden tunnel system in Czechia while in captivity. There are rumours about a treasure hidden in this facility.