A number of encrypted postcards from different times and places wait to be solved. Can a reader help?
A museum in Paris, France, keeps a notebook of French painter Camille Corot (1796-1875). A page in this document is encrypted. Can somebody break this cryptogram?
Blog reader Dominique Eggerstedt has found a bottle post in a canal in Northern Germany. It contains some text parts that look encrypted. Can a reader solve this mystery?
Blog reader Rosemarie Kohles from Coburg owns an old postcard written in a shorthand. Can somebody decrypt it for her?
The longest key ever publicly broken by exhaustive key search was 64 bits long. If you solve the cryptogram I introduce in this blog post, you can set a new record.
A recent article in the Sherlock Holmes fan magazine “The Baker Street Chronicle” reports on the relationship between the world’s greatest private detective and cryptology. In addition, it covers a few unsolved cryptograms from a real Victorian investigator.
A researcher from Liechtenstein has asked me for help. She has encountered three partially encrypted letters from the early 19th century. Can a reader decrypt 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.
A crypto book published in 1808 contains an exercise cryptogram. The solution is not given. Can you find it?
Three encrypted postcards from San Francisco are discussed in an internet forum. The solutions still seem to be unknown. Can a reader of this blog help?
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