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Two days ago, on Thanksgiving, the NSA sent encrypted greetings to “every NSA employee across the globe”. Can you break this encryption?
In 1913, an unknown person sent an encoded postcard to a man living in the then German town of Nieder-Jeutz. It is not possible to decipher this card unambiguously, but a few guesses can be made.
Siegfried Schwabl (born 1917) from the Salzburg area, Austria, wrote an encrypted diary. The solution is known, but has not been published. Can a reader decipher the diary excerpt that is available online?
The animal rights organisation PETA has found interesting ways to protest against animal cruelty.
A century ago, cryptologist André Langie reported about a really difficult dictionary cryptogram he had allegedly solved? Was it a strike of genius? Or was it a lie? Here is a similar challenge.
Two years ago, I published a list of all German WW2 encryption machines I was aware of. Meanwhile, I have some new information. Here’s an update.
Italian crypto history expert Paolo Bonavoglia has forwarded me a 19th century shorthand note from Italy. Can a reader decipher it?
Two years ago, I blogged about five encrypted 19th century newspaper ads that contain Bible references. Blog reader Thomas Ernst found an interesting solution approach, but so far nobody has deciphered these cryptograms.
Peter Nüchterlein, the writer-in-residence in Wernigerode, Germany, has asked me for help. In a Vienna archive he has found over 100 encrypted documents from the Thirty Years’ War. Today, I am going to introduce five of them. Can a reader decipher them?
Designing a secure manual encryption algorithm is a challenge. Some cryptographers have developed ciphers that require a deck of playing cards. The best-known one of this kind is Bruce Schneier’s Solitaire. Today, I am going to introduce another one: Talon by Aaron Toponce.
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