Here’s a postcard written in English that contains two kinds of encryption. Can a reader decipher this two-part cryptogram?
Here’s another crypto postcard. As the encrypted part of the message has only 17 letters, it is probably hard to decipher.
The Würzburg Residence is one of the most famous castles in Germany. A painting inside shows an encrypted inscription. The solution of this cryptogram is not known to me.
In 1909, an unmarried woman in Newcastle, Australia, received an encrypted postcard. Can a reader decipher it?
The second encrypted message from the Zodiac Killer is one of the world’s most famous unsolved cryptograms. According to computational linguist Tom Juzek, it will never be solved because no solution exists.
Murder victim Ricky McCormick left behind two encrypted notes. Both the crime and the cryptograms are unsolved to date.
Today I am going to introduce two encrypted diaries. Only one of these is solved. Can a reader decipher the other one?
Only three of the many encrypted postcards I have covered on this blog so far have remained unsolved. The one I am going to introduce today might be number four.
In 1934, a US magazine published an encrypted message a reader had found in an old document. The solution is not known to me.
Two postcards from the early 20th century are written in Morse code or something similar. One of these cryptograms is still unsolved.
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