The four ciphers, three of which are unsolved, are the most alluring attribute of the Zodiac Killer among most with cryptoanalysis tendencies.
408-cipher
Solved by Donald Harden.[1]
340-cipher
Unsolved. Known as the "Dripping Pen" cipher.
13-cipher
Unsolved. Known as the "My name is--" cipher.
32-cipher
Unsolved. Known as the "Button Letter" cipher.
References
- ↑ Oswell, Douglas E. The Unabomber and the Zodiac. 2007. Google Books. Web. 1 Nov. 2012.