Today I’m going to present a 28 letter message that has been encrypted with a Playfair cipher. To my knowledge, such a short Playfair cryptogram has never been solved before.
Codebreaking expert and book author Helen Fouché Gaines created a crypto challenge that is unsolved to this day.
A US radio station and a US non-profit organisation have received letters that look like code messages. Can a reader decipher them?
Two more bottle posts have been found in Hamburg, Germany. Still, nobody seems to have a clue what these strange messages mean.
In the 1960s, blog reader Werner Frank acquired a number of lamps bearing strange inscriptions. Can a reader make sense of them?
In 1890, a year after her wedding, a Bavarian princess received two encrypted postcards. Can a reader decipher them?
In Canberra, Australia, there is a set of eight steel pillars bearing encrypted inscriptions. So far, they have not received much attention in the codebreaking community. Some of the cryptograms are still unsolved.
In 1897, an unknown person published an encrypted advertisement in the Daily Telegraph. The only two words left in the clear are JIM LOCKET. Can a reader break this cryptogram?
British author Lady Gwendolen Gascoyne-Cecil encrypted a passage in her diary. This cryptogram has never been solved.
Over two decades ago, a series of strange messages were spread in the Usenet. Their origin and purpose are still a mystery.
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