by Jackson Kelley

Imagine a man who killed 37 people, and sent a letter to a newspaper revealing his name… yet the identity of this person still remains a complete mystery. On this episode of Serial Unsolved Ciphers we explore the mystery of the Zodiac Killer, a murderer who attacked during the 1960s in Northern California. We delve into the ciphers themselves, including how one of them was broken by two high school teachers. We, explore who the Zodiac Killer could be, why the second cipher is unsolved, and even talk about the popularity of Zodiac Killer in today’s society.

SOURCES

https://patch.com/california/fostercity/has-the-code-of-the-zodiac-killer-been-cracked

Used for more info into alleged solve of the Z340 cipher

https://en.oxforddictionaries.com/explore/which-letters-are-used-most

Frequency of letters in the alphabet

https://www.biography.com/people/zodiac-killer-236027

Biography on the killings of the Zodiac Killer

http://www.purple-planet.com/mysterious-backgrounds/4588158576

Background Audio and Music came from this site

http://www.elonka.com/UnsolvedCodes.html

Helpful in looking up unsolved codes

https://en.wikisource.org/wiki/Zodiac_Killer_letters#July_31st_1969

The full list of all the letters that the Zodiac Killer sent

http://www.wondersandmarvels.com/2013/02/the-zodiac-killer-ciphers.html

Essay written by former Vanderbilt student which was incredibly helpful in learning how the cipher was broken

http://zodiackillerfacts.com/main/the-340-cipher-dead-ends/

Helpful for learning about the methods people tried to solve the other cipher

http://zodiackillerciphers.com/wiki/index.php?title=FBI_analysis_from_Dan_Olson

FBI Analysis of alleged solved cipher

http://zodiackillerfacts.com/main/the-starliper-solution/

Invalid Solution

http://www.oranchak.com/zodiac/corey/hoax.html

How the cipher should have been deciphered by Corey

http://www.zodiologists.com/z408_cipher_filler_theory.html

The last 18 lines of the Z408 cipher theories

http://www.zodiackillerciphers.com/?p=233

How Harden solved the Z408 cipher

http://www.zodiacciphers.com/suspects.html

Potential Suspects