Hello
I had noticed it some time ago , it’s nothing amazing , but I share .
I noticed that the "black circles" symbols are at the beginning of the Z408 , when we have it in vertical , in period 19 , at its beginning (3) and from the tenth line (2) . Remember that the path that was used by the team to break the 340 was in period 19, in 3 parts
two parts of lines in period 19 and two lines in partial ”mirror

That is, the black circles appear at the beginning of the 408 in period 19 and in the "second part" (10th line, just like the 340) also in period 19.
Maybe it was a hint .

Marcelo.

Hello

Looking at the Z 408, vertically arranged, there are several symbols in "period" 19. (the coding form of the z340)

I found curious the alphabetical symbols KK II LL arranged, in a certain way, in period 19.
KILL, may also have been a clue to the cipher 340

Marcelo

Hello .
Some time ago , I noticed that the sequence of abbreviated months noted on the letter that accompanied cipher 340 ( with no space between them) is 17 in length ( standard for the lines on ciphers 408 and 340)

DESJULYAUGSEPTOCT

that the same months written in full, i.e. without abbreviations, are 34 in length (2×17)

DECEMBERJULYAUGUSTSEPTEMBEROCTOBER

I found curious the "error" in the abbreviation of the month of December, DES instead of DEC. (Changing the letter C for letter S)

Then I noticed that , the total of letters beginning with C and ending with S is 17 of fulfillment .

C defghijklmnopqr S

I found this pattern curious .

I also noticed, some time ago, that when we arrange the sequence DESJULYAUGSEPTOCT, just below the last two lines deciphered by the boys, we have something like THE END in the right and left columns.

Notice that, when considering only the abbreviation DES, it is exactly the starting point for a reading in period 19.

What does that mean? I haven’t figured it out yet.

Marcelo

See, if we consider the sequence of months and the symbol = and the number 7.

DESJULYAUGSEPTOCT=7

DESJULYAUGSEPTOCT
=7DESJULYAUGSEPTO
CT=7DESJULYAUGSEP
TOCT=7DESJULYAUGS
EPTOCT=7DESJULYAU
GSEPTOCT=7DESJULY
AUGSEPTOCT=7DESJU
LYAUGSEPTOCT=7DES
JULYAUGSEPTOCT=7D
ESJULYAUGSEPTOCT=
7DESJULYAUGSEPTOC
T=7DESJULYAUGSEPT
OCT=7DESJULYAUGSE
PTOCT=7DESJULYAUG
SEPTOCT=7DESJULYA
UGSEPTOCT=7DESJUL
YAUGSEPTOCT=7DESJ
ULYAUGSEPTOCT=7DE
SJULYAUGSEPTOCT=7

we have the (partial) reading in period 19

Marcelo

Hello!!

I already did this with the final Z18 sequence of z408 , EBEORIETEMETHHPITI , now I made the visual art with the symbols ,
Note that the symbols, when arranged normally (logically) on 18 lines of 17 symbols, either normally or vertically, can be read in period 19 and obviously in two parts of 9 lines each. The same way the team used to decipher the z340,
I found it curious that the symbol was at the beginning and end of the first part.

be well and safe all
Marcelo

Hello .
A few observations , on reading the http://zodiackillerciphers.com/wiki/index.php?title=Encyclopedia_of_observations

The 408’s cipher alphabet is missing the cipher symbol C. The 340’s cipher alphabet is missing the cipher symbol Q. It is strange that in both ciphers, Zodiac left out one letter from the cipher alphabet. He bothered to create new shapes and rotated letters, but still left out a "normal" letter in each cipher

I noticed that the letter Q is the seventeenth letter of the alphabet ( 17 closely linked to the ciphers of the zodiac )

I noticed that between the letter C and the letter Q , we have 13 letters of distance , the same length of the code Z13.

as always, sharing

Marcelo

Hello.

One more observation

I had already noted that the months written in the letter that accompanied the 340 cipher
DESJULYAUGSEPTOCT , are 17 in length .

DES ( december) caught my attention by the fact that the author had "misspelled" the correct spelling , which should have been "DEC", well,
If we look at the position in the alphabet of the letter S, we have the nineteenth position, which is the period used of coding.

abCdefghijklmnopqrS

I also noticed, that from the letter C to the letter S we have 17 letters of length .

CdefghijklmnopqrS

sharing

Marcelo

Hello.
I found it interesting ,
when we arrange the last 18 letters decoded by the team in the Z340, in 18 rows of 17 columns, just like the first two parts, the words, PARADICE and DEATH appear vertically.

Which is something , similar , to the idea of how zodiaco encoded the first 18 lines of the 340 , ( Wrote vertically and moved diagonally ) , which is well explained by Dave in one of his videos.

. Yes, logically they would appear, for the period is 19, however, I did this having the number 18 of the final sequence of the 408.

Marcelo

Posted by: @marclean

I would very much like to know if , this phenomenon , can be random , I mean , using the letter tracks on a keyboard generating symbols and/or letters would be the same as using random values. A mathematical study, made by someone more capable that I should be made

Hey Marclean,

As I recall, one of the things about the QWERTY phenomenon that makes it potentially misleading is that the qwerty layout was originally devised with both letter frequency and common English ngrams in mind.  As a consequence, even if Zodiac had a randomly generated list of symbols that he was popping into his plaintext as he was writing it, thereby creating his key as he went along, there would be a bias towards certain groupings that would, in turn, be reflected on the keyboard.

Having said that, at a glance, there are some odd commonalities that show up when mapping z408 and z340 to the QWERTY keyboad, especially when also including the correct substitution order.  

Here are some interesting ones:

1) the 6th substitution for plaintext ‘E’ is the same for both ciphers(‘N’)

2) “S”, “W” and “A” have a bias towards the upper left side of the keyboard. 

—–In z408, (‘A’) decodes to ‘W’, (‘S’) decodes to ‘A’, and (‘W’) decodes to ‘E’. 

—–In z340, (‘A’) and (‘S’) both decode to ‘D’, and (‘W’) decodes to ‘W’

3) (‘D’) decodes to ‘N’ in both ciphers

4) In z340, (‘E’) and (‘Z’) decode to ‘R’ whereas in z408, (‘E’) and (‘Z’) decode to ‘E’, which is directly adjacent to ‘R’ on the keyboard.  These two homophones are also substituted in the same order in both ciphers.

5) In z408, (‘D’ backwards) decodes to ‘O’.  In z340, (‘D’ backwards) decodes to ‘L’.  ‘O’ and ‘L’ are adjacent on the QWERTY keyboard.

6) In z408, (‘E’ backwards) decodes to ‘C’ and and in z340, (‘C’ backwards) decodes to ‘E’)

7) (‘P’) and (‘K’) decode to ‘I’ in both ciphers.  In z408, (‘H’) and (‘I’) decode to ‘T’, while in z340, (‘H’) decodes to ‘I’ while (‘T’) decodes to ‘O’ which is right next to ‘I’

8) In z340, there are 4 homophones that look like arrows.  3 of them (‘V’), (‘<‘), and (‘>), when mapped to QWERTY in the correct substitution order form a 3 sided border with (‘R’) at the center.  These homophones decode to ‘I’ and ‘O’

This is just what I’m seeing at a cursory glance.  I’m not saying it means anything in particular because, again, there are some complicating factors with the QWERTY analysis.  I also lack the mathematical background to evaluate it properly, so for now, I’m not fully convinced either way as to whether this is a real observation or ‘noise’ as doranchak calls it.  

Anyways, here is a QWERTY key with both ciphers mapped to it.  z408 is on the left hand side of the columns.  z340 is on the right hand side of the columns.  I haven’t been through the substitution order for z340 with a fine toothed comb, but from what I saw when briefly crosschecking, the most recent key for z340 does preserve the substitution order so that’s what I used.  Hope it helps! (*and I hope it posts)

@tegean

Wow , very interesting study ,tank u !!! ? 

Yes, indeed, there is no way to know, without a deeper mathematical study, how much this phenomenon “QWERTY” is coincidence or something intentional, really, this escapes my capacity to analyze.

Well, I guess you must have seen my other posts in the old community (alias the new site is beautiful, magnificent).

For example
The sequence EBEORIETEMETHHPITI
(Observe the image)

The code Z13

Observe the image
Note that, the keys 408 and 340, given the beginning of the first symbols, have adjacent keyboards (and to the left, like the position of the letters on a typewriter keyboard.

But yes, this may just be “noise” and not necessarily a pattern.

Marcelo

Olá. ? 
Eu tinha percebido isso há algum tempo.

Bem, aplicando as chaves de z340 ez 408 az 13, temos 9 símbolos “decodificados duplamente”.
Ou seja, temos 18 letras.
Lembrei-me da frequência final do z408
EBEORIETEMETHHPITI

Estou fazendo alguns testes com diferentes métodos de decodificação (Vigenere, por exemplo)

Estou trabalhando, portanto, com as sequências

WEEDSHEWHDREEAOEDO

EBEORIETEMETHHPITI

compartilhando ideias

Marcelo

Hello ,
Nothing relevant, most likely a coincidence.

I noticed that the phrase “THE ZODIAC SPEAKING” without spaces is 17 in length.

THEZODIACSPEAKING 

Another thing, when we have 9 lines with the phrase (like the first two parts of the z340, 9-9-2), we can read diagonally (period 18) the phrase “going up and down”.

Marcelo

Hello , 🙂

Basically the idea is simple ,
We have the decoded plain text of the Z408 in a vertical mode , of the same design as the original cipher , 24 rows and 17 columns .
I observed that the two words Killing of the plain text , get symmetrical . Curious, but I found more curious the fact that, when we look at them and read them diagonally, it is very suggestive of diagonal reading in a period, of course not 19, but it is similar to the way the boys used to finally decipher the 340 cipher.We have “Killing” whether diagonally left or right. 
I think the image illustrates what I mean
If this was a clue to the next cipher, I cannot say
sharing

Hi

As a complement to the previous post, when we arrange the 408 cipher in the same way , that is , in columns ( keeping 17 columns and 24 rows) , in the segment that the Killing Words are symmetrical, looking at the first 4 columns , we have the alphabetic B symbols and the E symbol ( mirrored) in something like “period 19.”

Just a look at previous things I have posted.:)
Without Jarvle’s AZD program and Dave’s site, I really wouldn’t have the patience to do this stuff.
The basic idea is the same, we put the ciphers symbols in columns, 408 and 340, keeping the dimensions, i.e.
408 – 17 columns , 24 lines
340 – 17 columns , 20 lines,
We put the 340 in an inverted manner, that is, from bottom to top (flip).

Note that the sequence of symbols in period reading 19 appear at the beginning of the 408, appear in the 340 (which was decoded in this way of reading).