This is a new study from a member of the FBI Cryptanalysis & Racketeering Records Unit on the Kaczynski codes.
It is the best most complete study I have seen to date. If TK was Zodiac, I suspect that he may have used earlier, simpler versions of some of the methods here. Some of the methods TK used to increase difficulty, and which he may have used in the Zodiac 340, include letters for numbers, math, intentionally misspelled words, intentional encryption errors, some words uncoded and in ordinary English, vertical and diagonal elements, a few nonsense words and occasional words in Spanish or German.
Thanks to Doranchak [ http://www.zodiackillerciphers.com/ ] for passing this along to me. I did screen captures to create all the pages of the study, but if anyone wants the PDF file of the study send me a PM with your email and I will send it to you. I also posted this in the TK section, so if you want to have specific discussions about TK, post there. I am posting it here for those with a general interest in codes and for what ideas if any the TK methods might give us for tackling the Zodiac 340, and any questions, comments or thoughts others might have on this study.
MODERATOR
Thanks AK Wilks, the systems he used are thought provoking. Do you, or anyone else have a copy of this cipher in a text format?
Thanks AK Wilks, the systems he used are thought provoking. Do you, or anyone else have a copy of this cipher in a text format?
You can see everything we have here: viewtopic.php?f=102&t=211
And here: http://www.ciphermysteries.com/2013/03/ … er-journal
The journals in his cabin detail all of his Unabomber crimes, but in light of his growing reputation as a serious political terrorist, radical environmentalist and anti-technology activist, they also state that accounts of other unspecified crimes (Zodiac and/or Tylenol?) have been burned or buried because their disclosure could be "dangerous, embarrassing or just very bad public relations at this time".
Also, check this out – it shows that both Z & TK used intentional misspellings to increase difficulty, and also shows how all of TK’s entries were reduced to his complex number code.
Z – misspells words, probably intentionally in most cases. Examples of last consonant in word changed to a vowel in the Z408.
TK – encodes "yesterday" as YESTERDAE.
JEM good eye!
Zodiac 408 Code: DANGEROUE . The "S" is changed to an "E".
Unabomber Code: YESTERDAE . The "Y" is changed to an "E".
Both Zodiac and Kaczynski have a code in which in order to increase difficulty of solution they change the last consonant (S, Y) in a word to the vowel "E".
MODERATOR
Wow man, I was very interested in all this, it is quite fascinating (I do not mean Kaczynski) but the "environment" of the codes.
Marcelo 
https://zodiacode1933.blogspot.com/
