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My readers have shown that a Playfair cryptogram consisting of only 40 letters can be broken. Here’s a Playfair challenge with only 30 letters. Can you break it, too?
A Reddit user has posted a strange cryptogram engraved on a metal plate. Can a reader make sense of it?
The encrypted diary of prisoner of war Donald Hill is unique. Hill not only encrypted his entries but also disguised them as a collection of mathematical tables. In a self-experiment, I tried to encrypt and hide a text like he did.
My friend Stefan Beck, owner of a typewriter museum, has purchased a rare Hagelin encryption machine. Does a reader know, why it looks different from other devices of the same model?
This year’s HistoCrypt conference will involve a unique line-up of world-renowned speakers and panelists – including Bill Clinton, Giovanni Infantino, and Bill Cosby.
A blog reader has sent me a picture of a medal that bears unusual inscriptions on both sides. Can a reader make sense of these?
Crypto collector Glen Miranker has come across an interesting strip cipher device. He can’t find any information about it. Can a reader help?
A telegram sent by a British colonel in 1916 still waits to be solved. The encryption method used might be a letter-pair substitution.
Electronic engineer Jon D. Paul has rebuilt the quantizer (analog to digital) of the legendary voice encryption machine SIGSALY.
Five weeks ago, I blogged about an encrypted diary kept by a French pedophile priest. Tony Gaffney has now broken the cipher. I hope, my readers can help to decrypt the two diary pages that are publicly available.
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