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Two encrypted newspaper advertisements from 1875 are still unsoved. Is the first one the key to the second?

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In the intro of the German TV film “Im Namens meines Sohnes” a message is hidden. It is easy to solve.

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Here’s a nice crypto challenge I found in a paper about the Fourth International Students’ Olympiad in Cryptography. Can you solve it?

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A dog tag introduced by a Reddit reader bears an inscription that looks like encrypted text. Can a reader solve this cryptogram?

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For almost 40 years, an unknown person has published cryptic advertisements in a US university newspaper. It is still unknown who is behind this game.

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A Donald Duck comic story, which was recently republished in a German Disney magazine, contains an encrypted message. The solution, if it exists, appears to be unknown. Can a reader break this cryptogram?

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The Rohonc Codex, one of the world’s most famous crypto mysteries, appears to have been solved. Here are the details about the solution.

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The Rohonc Codex, one of the world’s most famous crypto mysteries, appears to have been solved. And yes, I believe this solution is correct.

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Here’s a great challenge for my readers: Robert Bunch (1820-1881), a British spy in the US Civil War, left behind a number of encrypted messages that have never been deciphered. Can you solve this mystery?

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Nathan Allen from Maryland died from a bomb that exploded in his car. The murderer was found with the help of a steganographic technique.