
Four ciphers. Two solved. Two not. The Zodiac Killer's name might have been sitting in FBI custody since 1970.
In 1969 a killer sent a cipher to three San Francisco newspapers simultaneously. Publish this or I'll go on a killing rampage this weekend.
The newspapers published it.
The FBI couldn't crack it. Naval Intelligence couldn't crack it. A schoolteacher and his wife solved it in eight days at their kitchen table. The decoded message boasted about killing. Talked about collecting slaves in the afterlife. Misspelled paradise as "paradice" the same misspelling appeared in every letter he ever sent.
He sent three more ciphers after that.
One took fifty one years to crack. When researchers finally decoded it in 2020 it contained no name, no location, nothing that helped identify him. Solving it told investigators what he was thinking. Not who he was.
One cipher is thirty two characters possibly directions to something that's been sitting in the Bay Area since 1970. Nobody has gone to find it because nobody has finished reading the map.
And then there's Z13. Thirteen symbols. Preceded by three handwritten words: MY NAME IS —
The FBI has had it since April 1970. Fifty six years.
Do you think his name is actually in there or was Z13 always just another taunt?