Zodiac Discussion Forum

Indeed, there is a concealed cipher in this postcard. I think I understand at least most of it. I could not find this cipher mentioned anywhere on the…

Can anyone confirm that the postcard was a standard, 5 by 7 inch? If yes, then the distance between the two crosshairs symbols is 3.3 inch! This is p…

Consider Zodiac’s description of the bomb (click any image for high resolution): We see that he placed two "photoelectric switches" on t…

Irvine and others have raised the possibility that Zodiac’s clues may be so convoluted that even the correct solution would not be recognized as such….

Thanks, Irvine. Indeed, each clue is ambiguous individually, but this is so by construction: Zodiac clearly did not want the solution to be easy. Ther…