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Ernest Rinzi was a 19th century jeweler, goldsmith and miniaturist. He left behind an encrypted journal that is still unsolved. My first impression is that this journal is the most notable unsolved encrypted book after the Voynich Manuscript and the Rohonc Codex.

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The Freemasons are known to have created a great variety of encrypted documents. Can a reader solve this one from the 19th century?

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Five years ago an encrypted carrier pigeon message from World War II hit the news. So far, nobody has been able to decipher it.

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An encrypted postcard from the 1870s is written in a strange code. Can a reader solve it?

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In October 1984 unemployed German food engineer Günther Stoll died of murder or accident. Shortly before his death he had written the word YOG’TZE on a piece of paper. Neither the reason of Stoll’s death nor the meaning of YOG’TZE has ever been found out.

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A 17th-century Italian nun claimed that the Devil had dictated an encrypted letter to her. Scientists have now allegedly broken this cryptogram. Details are not known yet.

Voynich-Artif-Bar - Kopie

Meanwhile over 50 scholars have claimed to have solved the Voynich Manuscript. The latest alleged solution was published earlier this week in a renowned literature magazine. Does it make sense?

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Some of the crypto mysteries I recently introduced on this blog were quite tough. As a change, here are a few easier ones from a 19th century children’s magazine.

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Fascinating stories about hidden messages in texts, pictures and other objects – this is what my new book “Versteckte Botschaften” is about. Here are some of the highlights of this work.

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An encrypted message from 1939, sent from the German battleship Schleswig-Holstein to an address in Kiel, Germany, waits to be solved. Can a reader help?