![]() Let's just put the Z13 cipher upside down :Īssuming that the alphabetic signs stand for what they are (except for the letter M which becomes W because of the rotation), it's very tempting to read something like "want to know. ![]() The hypothesis made here is that an extremely simple, even simplistic, coding method was used. The various tests carried out, assuming that the code was written using the substitution method, do not seem to give very satisfactory results : so we can imagine that the coding method for the Z13 cipher is a little bit different from those used in other longer codes. However, using a substitution cipher for the Z13 (as for the Z408 or Z340) would not easily lead to a decodable message, since the text here is too short to find the correct key. ![]() I assume that the Z13 code was designed to be deciphered (and not as an unbreakable code or gibberish) : we can easily imagine the Zodiac being torn between his desire to show his intellectual superiority by imagining complex ciphers, but also his will that these codes can be deciphered so that their content can be known to the public. I don't think I've seen elsewhere the approach which I'll try to explain here, and which seems to provide a very simple (too simple ?) solution to the Z13 cipher (if this is not the case, my apologies in advance for having rediscovered something that has already been done before). I'm a newbie on this forum and I just want to share with you some thoughts I had about the Z13 cipher.
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