Bruce-Kallick-Handycipher-bar

Designing a secure and convenient encryption algorithm that doesn’t require a computer program or a machine is quite a challenge. The Handycipher is an interesting method of this kind.

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Crypto history expert Frode Weierud has found a number of encrypted messages in an archive. Can we help him to decipher these cryptograms?

Harry+Caroline-Tissie+Jabber-bar

Tissie and Jabber as well as Harry and Caroline were two amorous couples, who exchanged encrypted messages via newspaper ads more than a century ago. Their encryption codes are unsolved to date.

Silkdress-Slater-bar

Last week I presented the mystery of an encrypted note found in an antique silk dress. Has the codebook used now been found?

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A young man, who had disappeared from his home in California, sent an encrypted message from Israel to his parents. This cryptogram has been unsolved for over four decades. Can a reader decipher it?

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A letter sent by some Oscar P. Schaub in the 1920s looks like it has been written in Hebrew or a similar script. However, even Hebrew experts can’t read it. Is it encrypted in a clever cipher?

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Yesterday and today about 25 European cipher history experts have met at Smolenice Castle in Slovakia. It was a great event.

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There are hundreds of places in the world that are worth seeing for people interested in cryptology. This is why I have created a list of cryptographic sights. I hope, my readers can help me to extend it.

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A postcard from 1910 is encrypted in three different ciphers. Can a reader solve this unusual cryptogram?

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In 2014 Maryland-based costume collector Sara Rivers-Cofield discovered an encrypted note in an antique silk dress. This cryptogram is unsolved to date.