The Zodiac Killer was a famous serial murderer who operated in northern California between December 1968 and October 1969. The killer's identity remains unknown.
As in the case of Jack the Ripper, are recognized five canonical murders in areas of Benicia, Vallejo, Lake Berryessa and San Francisco.
First canonical attack
David Arthur Faraday (19 years old) and Betty Lou Jensen (16 years old). Killed by gunfire on December 20, 1968 at Lake Herman Road, on the outskirts of the city of Benicia.
Second canonical attack
Michael Renault Mageau (19 years old) and Darlene Elizabeth Ferrin (22 years old), shot on July 4, 1969 in Blue Rocks Springs, on the outskirts of Vallejo. Darlene died receiving first aid at the Kaiser Foundation Hospital, while Michael survived.
Third canonical attack
Bryan Calvin Hartnell (20 years old) and Cecilia Ann Shepard (22 years old), stabbed on September 27, 1969 in Lake Berryessa in Napa County. Bryan survived six stab wounds to the back, but Cecilia died of his wounds two days later at Queen of the Valley Hospital in Napa.
Fourth canonical attack
Paul Lee Stine (29 years old), a professional driver, killed by gunfire on October 11, 1969 in Presidio Heights, San Francisco.
The April 20, 1970, the murderer sent the following letter to the San Francisco Chronicle for two sheets. The coded message was never resolved:
The second page of the letter showed the map of a bomb that the murderer was to be used to blow up a school bus. At the end of the letter signed:
Zodiac killer 10 – San Francisco Police Department 0
Then as mere logical exercise, we try to solve the following coded message:
We note that this coded message was repeated in another letter.
This was the only cryptogram sent twice.
My name is _______
It should be noted that the encryption someone who has made their own codes, and you have to adjust to them. Do not study with standard techniques, and expect to find a perfect method.
The murderer was referring to his name.
Therefore, in this message there are missing letters.
It is missing the letter E in “NAM”, and it is missing the letter “Y” in “M”.
Why not locate the letters in a circle?
Letter Y and E.
What about if we formed a zodiac?
Sure, this is the symbol:
Then, the missing letters are Y, E, L and R.
It is a word separator.
And the another symbol?
This is a portion of a circle.
The first Word starts with an A, the second with a K, the third with a M, and the fourth with a N. The vertices of the segments.
Placing the letter A down and turning the figure:
We have a Zodiac.
Then, the first word is missing a L.
The second word is missing a R.
The third word is missing a Y.
The fourth word is missing a E.