Mt. Diablo cipher. Zodiac’s bomb was close to Alameda County Sheriff’s station in San Leandro

By Francesco Amicone Updated on December 18, 2020 "Foothill Blvd Hillcrest, 16 mi fro 570°" is the plaintext of the encrypted note contained in a letter from Zodiac postmarked June 26, 1969. The serial killer claimed to have reported in the cipher where he had placed a bomb.The decryption indicates that the target zone was …