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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.

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In 1934, a US magazine published an encrypted message a reader had found in an old document. The solution is not known to me.

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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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A Facebook user has posted a number of scans of a 19th century pocket lexicon with about 80 pages of code in it. Can a reader solve it?

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A medal that is depicted in a Freemason document from 1952 bears two encrypted inscriptions. Can a reader decipher them?

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In 1905, an encrypted postcard was sent from San Francisco to Paris. Can a reader break it?

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In the New York Public Library, I found a cryptogram from 1925. The cleartext could be the Declaration of Independence. I wonder who created this document and why.

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Around 1920, a US pulp magazine published an encrypted message exchange in its “missed persons” column. The cleartexts might refer to a familiy drama. Even two of the world’s greatest codebreakers apparently could not make sense of these cryptograms.

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In 1863, during the US Civil War, a Union soldier wrote a letter to an unknown recipient. This letter is encoded in a shorthand, probably Pitman. Can a reader decipher it?

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The US Navy cryptologists use a logo that contains an encrypted message. Can a reader decipher it?