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A British censorship manual from WW2 introduces a wide range of message hiding techniques. Some of the examples given are hard to comprehend. Maybe my readers can help.
In World War 2 the Germans used more than a dozen different cipher machines. A few more were developped but not used in practice. This article gives an overview.
Traffic analysis is a powerful surveillance technique used by secret services and large IT companies. In an interview, Dutch IT expert Bart Wessel explains how traffic analysis works and why so little is publicly known about it.
The British mail authority has issued a set of six stamps devoted to crime writer Agatha Christie. The stamps are packed with steganographic messages. Can you find them?
Today’s post is about a book with strange illustrations written in an unknown script. This book still waits to be deciphered. And no, I’m not talking about the Voynich manuscript.
130 years ago, Briton Alfred Janes published a self-invented encryption method along with a challenge cryptogram. My blog readers could solve this tricky mystery.
A crypto book published in 1808 contains an exercise cryptogram. The solution is not given. Can you find it?
An encrypted bottle post was found in Kaliningrad, Russia, in 2015. As it seems, the cleartext is still unknown. Can a reader break this unusual cryptogram?
The Cheltenham Listening Stones are a set of nine sculptures located next to the GCHQ headquarters in Cheltenham, UK. Two of the stones bear an encrypted inscription.
Little was known about the ciphers of the Unabomber, a highly intelligent serial killer, until the FBI published a detailed description last year. Here’s a summary.
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