the Zodiac 340 got solved in 2020 and I'm still salty about how I missed it for years

longtime lurker on the cipher boards, half-confession here. the Zodiac killer (Bay Area, late 60s, Vallejo and around San Francisco) mailed in coded letters. the first one, the 408, got cracked fast in 1969 by a schoolteacher and his wife at their kitchen table, it was a homophonic substitution, mul……