The message was sent in November 1969 to the San Francisco Chronicle newspaper by the alleged serial killer, its code consisting of a series of cryptic letters and symbols. According to the trio said to have broken the code, the message includes boasts and defiance of authorities without any real clues on motive or identity. Zodiac Killer's 1969 cipher 'puzzle' finally solved https://t.co/5MLuAa81Oc pic.twitter.com/oESD0n14km — New York Post (@nypost) December 11, 2020A first message sent to Californian newspapers was decoded by a schoolteacher and his wife in 1969. But the code used in the first message was much simpler than the one for "340 cipher," so called because it contains 340 characters spread throughout 17 columns. The 340 cipher is read diagonally, starting from the upper-left corner and shifting one box down and two boxes to the right.

Source: Dhaka Tribune December 12, 2020 09:45 UTC