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Z340 has been solve…
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Z340 has been solved!

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Posts: 2614
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Topic starter


Last weekend, the 340 was solved and submitted to the FBI.
They have confirmed the solution.
Authorities have spent the time since then making the appropriate notifications to the victims’ families.
Now that the notification process is complete, we are announcing the solution in the latest episode of “Let’s Crack Zodiac”.


For a more detailed look at the story behind the solution, see this article: http://zodiackillerfacts.com/news-and-u … en-solved/


Posted : December 11, 2020 3:05 pm
Posts: 767
Prominent Member

:o Fantastic work by all involved. Congratulations

Posted : December 11, 2020 3:11 pm
Posts: 2547
Famed Member

My respects to the involved families. I hoped that the message would contain a name or some other piece of valuable information to the investigation but in turn we got more hurt. I am sorry.

It did turn out to be a period 19 cipher…

I wish to thank everyone that worked on this problem. Especially Sam for finding the needle in the period 19 haystack and David (doranchak) for recognizing a garbled solution that otherwise had not a great AZdecrypt score.

I would like to think that the many years of collaboration of the Zodiac Cipher Mailings & Discussion community members lie at the base of this achievement.
The discovery of period 19, the work and understanding of it, the many other observations, all happened right here. And perhaps, a few times we came unbelievable close to solving it. As doranchak says in his video, "this thing was a beast".

Thanks to:

– morf13 for giving us a place to work!
– doranchak for originally stirring my interest in the Zodiac ciphers. And just about everything else, cipher work, websites, wiki, tools, community development, videos… You brought it all together.
– glurk for zkdecrypto, without it there would be no AZdecrypt.
– smokie treats for all his work and collaboration on period 19. You were one of the driving forces behind some of the bigger threads on the forum which spawned so many observations and understandings. The countless test ciphers that you created forged AZdecrypt.
– Largo for all his work. I used Peek-a-boo to visualize the problems in the 2nd Z340 rectangle which made it easy for me to figure out how to fix it.
– Everyone else.


Posted : December 11, 2020 3:22 pm
Posts: 433
Reputable Member

Excellent work Dave, Congratulations !

Posted : December 11, 2020 3:33 pm
Posts: 415
Reputable Member

as someone who has followed your work for years i could not be prouder of a group of folks on the internet. your unwavering dedication and positive outlook had as much to do with this as your knowledge of encryption. congratulations on a well-deserved victory.

Posted : December 11, 2020 3:34 pm
Posts: 2614
Member Admin
Topic starter

Excellent work Dave, Congratulations !

Couldn’t have done it without Jarlve and Sam! They did an amazing job!


Posted : December 11, 2020 3:34 pm
Posts: 7527
Member Admin

Congrats team! You all deserve some admiration(and rest).
I have always said that it takes a special kind of person to have the patience to work on ciphers and meet with failure over and over, only to go back to the drawing board to start over. You are all those special people!

Now back to work there are still 2 unsolved ciphers! ;)

There is more than one way to lose your life to a killer


Posted : December 11, 2020 3:39 pm
Posts: 26
Eminent Member

Outstanding work! Bravi!!

Just a note, wouldn’it make much more sense if the two extra words would be put at the end? In this way you don’t have repetitions, and the message ends with a very fitting “Death is life”

Posted : December 11, 2020 3:57 pm
Posts: 154
Estimable Member

Congrats! It’s been fascinating reading your attempts over the years. What a payoff. Thanks to all for the dedication. Few will understand how much you put into it but I think we get it here!

Posted : December 11, 2020 4:13 pm
Posts: 53
Trusted Member

Good job to all you guys !!!! and everyone who has scratched there heads over this and went a little crazy!

Posted : December 11, 2020 4:31 pm
Posts: 18
Eminent Member

Great job guys !!! what an outstanding work !!! i can’t believe that it has finally happenend ! you have my total admiration for the relentless energy and will to solve it !!! thank you so much ! let’s hope that the DNA team will work has hard as you have done to put a name on this guy !

Posted : December 11, 2020 4:40 pm
Posts: 11
Active Member

Hello everyone! Thanks for the great work, first of all!

Is it possible to have the list of replacements?

Cipher to text and text to cipher?

Thanks again and congratulations!

Posted : December 11, 2020 4:50 pm
Posts: 249
Reputable Member

Kudos to all three of you! The effort everyone put in is incredible and should be rewarded. It’s an amazing accomplishment, one that will go down in the history books.
Standing ovation from my home.

Posted : December 11, 2020 4:53 pm
Posts: 1266
Noble Member

Outstanding. Congratulations to the team and all the cryptographers who persisted for years with what seemed like a doomed effort.

Posted : December 11, 2020 4:58 pm
Posts: 1588
Member Moderator

Thank you Dave aka doranC, Jarlve & Sam,
AmaZing! Your patience on this Attention Seeking Junk as Dave pointed out, Is paying off.


If Zodiac ever joined a Z forum, I’m sure he would have been banned for not following forum rules. Zam’s/Quote

Posted : December 11, 2020 5:13 pm
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