Zodiac Killer Research

  An entropy-based solution of the Z13 based on a cascade consideration of ciphers vol.3: A Z408 based proposal step-1 I. Introduction On May 5, 2024, I presented the first draft of a proposal for a solution of the Z13 based on a systemic, entropy-based method. On April 23, 2025, I made available the follow up on the solution, which included a more comprehensive explanation of the “8-ball” variant, whilst offering (1) a key, heavily based on the Z340 key plus a logical function as a singular expression for the substitution of the 8-ball with J L N for the ciphertext, followed up a transposition of the symbols for the plaintext, and (2) a teletype method for the rationalization of data in the plaintext [1]. On May 15, 2025, I offered the Runic and Zodiac systemic indexes not just as part of a hypothetical “value system” for the killer’s worldview (if not ideology), but as a practical means of identifying the significance, from a cultural-historical perspective of the Etruscan ...

  Canonical cipher 1_Z408 vol_1_Purgatory 1.                        From Hell The last day of this July marked 56 years since the sending of the three-piece Z408 [1]. After months of silence and a phone call assuming responsibility for both LHR and BRS in the early hours of July 5, 1969, the killer makes a stunning declaration of purpose: three newspapers receive the three pieces of a cipher. Two of them are the biggest papers of the biggest city of Bay Area: a foreshadowing of things to come. The choice of the papers is not random. As Soze has pointed out, the number of stamps in each envelope reflects the editorial and publishing history of each paper: the killer demonstrates for the first time that he is acutely aware of the history of the people he is sending his cipher to [2]. This demonstrates a system which may very well extend to the victims themselves (geneal...