Zodiackillersite.com

Jarlve wrote:Hey AK Wilks,

Is there more on the assumptions, "written columnarly, first line forward and second line backward etc" as it says?

These are all things I tried with the ZKDecrypto when I started with the cipher but I would still like to know the reasoning.

Thanks

The FBI documents I posted here are all that I have.

Morf got additional documents from the FBI and there might have been one more page of code analysis. Morf or maybe Doranchak might have it. I don't remember it as anything major and I don't remember it as touching on the specific points you are asking about. It was just a little more analysis similar to what I posted.

AK Wilks wrote:

Jarlve wrote:Hey AK Wilks,

Is there more on the assumptions, "written columnarly, first line forward and second line backward etc" as it says?

These are all things I tried with the ZKDecrypto when I started with the cipher but I would still like to know the reasoning.

Thanks

The FBI documents I posted here are all that I have.

Morf got additional documents from the FBI and there might have been one more page of code analysis. Morf or maybe Doranchak might have it. I don't remember it as anything major and I don't remember it as touching on the specific points you are asking about. It was just a little more analysis similar to what I posted.

If I have it, I have no clue where it is, I hope Dave has it

Here is the full context of AK's excerpt (which was missing a few bits):

And here are some more miscellaneous excerpts concerning the 340:

* Nov 8 1969 and Nov 9 1969 letters deemed to be from same author as previous correspondences.
* Nov 19 1969 document stating efforts continuing on analysis of Nov 8 cryptogram
* Nov 19 1969 documents concerning letter writer from Missoula, Montana who had been in contact with Napa PD to help decipher the Nov 8 cryptogram. Based on "cursor analysis" of cipher, letter writer thinks he is the next victim. A suspect is named but is redacted. Letter writer claims Missoula MT PD is actively protecting he and his family. FBI advises Butte PD to interview letter writer to determine basis for naming the suspect.
* An FBI note says the Crypto Section is attempting to decipher "some of these cryptograms" even though no Federal jurisdiction has been established yet. A redacted section of the note identifies someone (presumably the guy in Missoula, Montana) who has also been trying to decipher the cryptograms, and has contacted California authorities with a suspect (whose name is redacted).
* Nov 21 1969 and Nov 24 1969 documents stating that the Missoula, Montana guy phoned an FBI agent saying "If agent [redacted] had daughter named [redacted] and married to man named [redacted] SA (special agent) [redacted] should contact him immediately." Document goes over more detail of their interaction with the guy, in which he claims to have decoded the 340. FBI concludes there was no further reason to discuss the matter with him, as he was attempting to involve Missoula PD officers to lend credibility to his deciphering. "In previous deciphering of Zodiac message, claims he found name of Captain [redacted] Missoula PD, in message." "[redacted] feels [redacted] may be letting his imagination run rampant re: the many messages he claims he obtained deciphering the two cryptograms."
* Nov 21 1969 document requesting decipherment of letter received by [redacted] San Jose PD. "As noted, the message reads [redacted]". "After a cursory analysis, officers of the San Jose, Calif PD believe widow in message may be Mrs. [redacted] San Jose, Calif. San Jose PD intituting 24 hour surveillance on Mrs. [redacted]."

Anyone know more about the Missoula MT guy and his suspect? And what is the letter to San Jose PD threatening a widow in San Jose?

Here is some cryptanalysis of the San Jose widow cryptogram:



AK posted about this before. AK, did you ever find out more about the San Jose letter/cryptogram?

Thanks for posting those docs Dave. What is up now represents the totality of what we have on the FBI attempt, I believe.

No never found out much more about the San Jose letter. My FOIA and appeal were denied, consistent with someone in the letter still being alive, or could have been for other reasons.

We do have a thread on the San Jose letter. Interesting connection to Montana, and Morf and I looked for San Jose area murders.

viewtopic.php?f=78&t=1363

Thanks doranchak and others,

Special listings:

EDP for each character in Qc32 (340) and characters -9 to +9
EDP for Zodiac plain text, sorted alphabetically by words,
and words approx. -8 to +8
Stutter 2s and 3s in Zodiac plain text and decrypted message

What is EDP?
What is the Zodiac plain text? The letters that accompanied the 340?
What is the decrypted message?
What is meant by, stutter 2s and 3s?

If this is obvious, I'm really tired...

Jarlve wrote:What is EDP?

I thought that it might be "expected differential probability", which is part of differential cryptanalysis, but those techniques were not developed until the late 1980s, long after those FBI files mention EDP.

It may just be "electronic data processing."

For example, one excerpt says "EDP runs sliding word through messages except for impossible situations". Perhaps it just refers to using a computer to electronically plug plaintext words into the cipher text.

Jarlve wrote:What is the Zodiac plain text? The letters that accompanied the 340?
What is the decrypted message?

My guess is they are referring to using the known plain text from Zodiac's letters and the decrypted 408 as cribs in the 340, to try to unlock the 340.

Jarlve wrote:What is meant by, stutter 2s and 3s?

I wonder if they considered "dummy" syllables of length 2 and 3. For instance, from "Decrypted Secrets: Methods and Maxims of Cryptology":