Of the many unsolved ciphers I have encountered over the years, this is one of the strangest.
It is the encrypted postcard of George Furlong. Details can be found in the “Unsolved Crypto Mysteries” section of this website.
I have featured this postcard in numerous articles, conference presentations, and books. I have written about it in my Cipherbrain blog, discussed it in my employer’s Trust Magazine, and shared it through various cryptography mailing lists.
The result has been exactly zero. No one has been able to identify the writing system, let alone decipher the message itself. Despite considerable attention, the mystery remains completely unsolved.
If you have any ideas, observations, or leads, I would be delighted to hear from you.
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