The 340 cipher
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Archived from the IMDb Discussion Forums — Zodiac
fountaincap — 9 years ago(December 30, 2016 07:54 PM)
Just saw the film and I'm wondering if I misunderstood something. I was always under the impression that the 340 cipher has never been decrypted in real life. But the film showed one of Graysmith's kids asking him about what looks like the 340 cipher. The next scene of a televised interview then seems to imply that Graysmith had decrypted it. Was the film just taking liberties there in implying that it's been decrypted or did I misunderstand the scene?
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BlimeyCharlie — 9 years ago(January 29, 2017 07:36 PM)
Graysmith claimed in one of his two books about the case to have broken the Z340, but pretty much every genuine cryptographer who has examined his solution has deemed it "not valid". It remains uncracked to this day.