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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

  1. Oswell, Douglas E. The Unabomber and the Zodiac. 2007. Google Books. Web. 1 Nov. 2012.

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