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MadTinfoilHatter [soylentnews.org] writes:

In November 1969 a 340 character long encrypted message was sent in a letter to The San Fransico Chronicle. It appeared to be sent by a by that time already infamous serial killer, popularly going by the name Zodiac killer. [wikipedia.org] The cipher proved to be a very hard nut to crack, and the solution eluded cryptanalysts for over 50 years. On December 3rd three code breakers finally solved the mystery [sfchronicle.com] and here they tell us how. [youtube.com]

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