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I hereby invite all my readers from Germany, France, UK and the Benelux region to join me at the “Top Secret!” exhibition in Mons, Belgium, next Saturday.

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A store in Peekskill, New York, has an interesting encryption machine on sale. Can my readers help to find information about the background of this device?

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The gravestone of John Laird McCaffrey in Montreal, Canada, bears a hidden message. Last week I had the chance to go on site and take a look at it.

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Thanks to blog reader Christian Baumann, a completely new version of my Cryptologic Travel Guide is now avaible. Almost 100 museums, libraries, graves and other sights with a relationship to cryptology are now displayed on an interactive world map.

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The gravestone of William and Elizebeth Friedman in Washington, DC, bears a hidden message. A few days ago I had the chance to go on site and take a look at it. Here’s my report, including a video that shows Elonka Dunin explaining the code.

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CRAQUEREZ, SAUKNOTEN, INCLEMENTE – these are three words from an encrypted message sent from Manila to Washington in 1898. Can a reader break this cryptogram?

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The biannual Symposium on Cryptologic History organized by the NSA is the most important crypto history event in the world. Here’s my report on the 2017 edition.

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Two years ago an encrypted bottle post was found in Kaliningrad, Russia. Can a reader break this cryptogram?

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William and Elizebeth Friedman, two of history’s greatest codebreakers, published a book dubunking the idea of hidden codes in the works of Shakespeare. However, the book itself contains a code. Can you find it?

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Cardsharping with steganography is a popular motive on classical paintings. Here are five examples.