Solved 340-character cipher

Zodiac, the serial killer who terrorized Northern California in the late 1960s, sent four ciphers to local newspapers. The first cipher was separated into three different parts and each part was sent to Vallejo Times-Herald, the San Francisco Chronicle, and the San Francisco Examiner. The combination of all three parts formed a 408-letter cipher, which was decrypted one week after it was received. Zodiac also sent a 340-letter cipher, mailed on a card on November 8 1969, that was recently solved.

High-resolution scan of the 340-character cipher

Cipher as it appeared in the SF Chronicle on Nov 13, 1969 (Credit - Deborah Silva, who posts as Seagull on the Zodiac forums)

• Solution to the 340
• Frequency analysis for the 340
• Articles and details about the 340
• Homophone sequences in the 340
• The Pivots
• Hypothesis Testing
• Other considered possibilities
• Halloween Card