50 postcards written by two aerospace technicians in 1968 contain encrypted and hidden messages. If you want to solve them you should listen to “The Soyuz Files” podcast.
In World War 1 a female spy in France used a chess board and chess pieces to code a secret message.
In the 1950s the Germans used a unique crypto device named “Violine”. I have always wondered what it was used for. In a book about espionage I found the likely answer.
Researchers tested whether two artificial intelligence systems could develop an ecryption algorithm a third one could not break. In some test runs it worked.
Two texts in a book written by Renaissance genius Francis Bacon contain hidden messages. Can a reader find them?
A Rubik’s Cube can be used to implement a highly secure encryption method.
In 1941 the German chemicals group Bayer sent an encrypted letter to Columbia. British codebreakers were able to decipher it.
The FBI has recently declassified crypto-related files from the 1940s. These files contain a number of amusing stories.
Around 1990 David Kahn, the father of crypto history, met a tall man wearing a suit and glasses. This is documented on a photograph. Does anybody recognize this man?
Nathaniel Bar-Jonah (1957-2008) was a felon convicted of kidnapping and sexual assault. According to a website, he left behind an encrypted note. Is this note genuine? Can it be solved? I hope my readers can answer these questions.
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