In a Kansas library an unknown person has written an encrypted message into a book. Can a reader solve this “book cipher”, which is probably not a book cipher?
In 1909, an unmarried woman in Santa Monica received a postcard encrypted in an unusual cipher. Can a reader break this encryption?
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?
In 1978, a Kansas TV station placed a subliminal message in a TV program in order to catch a serial killer.
German poet and translator Stefan George (1868-1933) created his own secret language. It has never been deciphered – probably because only two lines written in it have survived.
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?
A Polish publishing house has launched a new Voynich manuscript facsimile. Another Voynich replica – much smaller in size – is available as a doll house accessory.
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.