In this Mystery episode we focus on the Zodiac Killer's Z340 cipher — the 340-character code sent to the San Francisco Chronicle in 1969 that the FBI, NSA, and thousands of amateur cryptographers failed to crack for 51 years until three people solved it from their homes in 2020 using modern computational methods, and what the decoded message actually says.
Fifty-one years. Three amateurs. The cipher broke in 2020.
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