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A recent book mentions a cipher used by a German spy during the Second World War. Can you break a message I encrypted with this method?
A few years ago, German late-night show host Stefan Raab presented a number puzzle in his show “TV total”. It involves cryptography and should be easy to solve for readers of this blog.
From 1833 to 1836 two lovers in England exchanged 35 love messages via encrypted newspaper advertisements. The key is known. Can my readers help me to decrypt these messages?
Various codebreakers have solved thousands of original Enigma messages from World War II over the last few years. Here’s a message of this kind that is still unsolved. Can my readers help?
Just like every end of year, I am awarding the Golden Alice for outstanding achievements in the field of crypto history and codebreaking. Here are the winners 2018.
Here’s an encrypted postcard from the town of Mannswörth, Austria. Can you decipher it?
In 1922, a man from Luxemburg sent a postcard to a recipient living in the famous brandy town of Cognac, France. The message on the postcard consists of only seven letters. Can a reader find out what it means?
A cryptogram that was found on the wall of a tunnel at the University of Texas has been discussed on several websites for years. Can a reader of this blog finally find the solution?
My readers have shown that a Playfair cryptogram consisting of only 50 letters can be broken. Here’s a Playfair challenge with only 40 letters. Can you break it, too?
I have an appearance in a YouTube video that introduces the ten most notable unsolved cryptograms. More than a million people have already watched it.
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