I am interested to know whether if you slide a large corpus of plain text through homophonic keys of varying efficiency ( from high diffusion of high frequency plain text to low diffusion of high frequency plain text with the symbols spread out more evenly on the key ), whether any will have a spike like P15/19. And then maybe a large corpus of poetry with a lot of rhyming words.
Interesting idea, I will try that! In my previous tests I’ve used always the same key.
However, it is vital that you match the ioc of the 340 if you want to do meaningful comparisons. Your cipher has a raw ioc of 1857 while the 340 has 2237. A higher ioc means more bigrams and lessens the chance of outliers.
Thanks! I’ll have a closer look.
Excerpt from the book Dracula by Bram Stoker.
Nice work! I thought that this cipher could fool AZDecrypt since it takes a long time so solve even when it is not transposed. Don’t know the reason, but the high unigram counts could be the problem. If you feed the transposed cipher into AZDecrypt’s transposition solver no solution is found. I increased the "Restarts" Option to 8 but still got no solve after half an hour. I wondered if some harder to solve ciphers could be "overlooked" by the transposition solver since they would take too long to produce a good score.
If you feed the transposed cipher into AZDecrypt’s transposition solver no solution is found. I increased the "Restarts" Option to 8 but still got no solve after half an hour. I wondered if some harder to solve ciphers could be "overlooked" by the transposition solver since they would take too long to produce a good score.
I solved it manually by looking at the statistics. The cipher is indeed hard to solve for AZdecrypt with default ngrams. The main problem is that it has a strong local maximum such as the purple haze cipher by smokie. Using the reddit 6-grams will help allot with such. Your cipher has some random bigram peaks as well. It probably needs iterations more than restarts so increasing the iterations may do the trick. If you suspect that random bigram peaks are the problem then reduce the bigram beam states to 64 or less. Also, reducing the operation stack size will help if you suspect a lower number of transposition steps.
Thanks for the interesting cipher. And yes, the transposition solver can overlook things.
I am interested to know whether if you slide a large corpus of plain text through homophonic keys of varying efficiency ( from high diffusion of high frequency plain text to low diffusion of high frequency plain text with the symbols spread out more evenly on the key ), whether any will have a spike like P15/19. And then maybe a large corpus of poetry with a lot of rhyming words.
You guys did you see that there is a new television series coming out on Tuesday on the History Channel? Not just one show, but a series called "The Hunt for the Zodiac Killer."
http://www.history.com/shows/the-hunt-f … ller/about
Does anybody have a z340 font that I can put into Excel by any chance? I would like to show symbols instead of numbers some times. Thanks.
Does anybody have a z340 font that I can put into Excel by any chance? I would like to show symbols instead of numbers some times. Thanks.
Yes, I have. A .ttf file is included in my peek-a-boo tool in the folder "fonts". It maps to my default 340 transcription.
Direct download: https://www.dropbox.com/s/2ypfvap4fs96n … n.ttf?dl=0
It uses a-z, A-Z, 0-9, +-:;
You guys did you see that there is a new television series coming out on Tuesday on the History Channel? Not just one show, but a series called "The Hunt for the Zodiac Killer." http://www.history.com/shows/the-hunt-f … ller/about
Here’s the thread about it: viewtopic.php?f=23&t=3575
I’ve posted an assortment of promotional clips here, including a two minute preview that shows a full scene from the show: http://www.zodiackillerciphers.com/
Some of us were involved with the documentary. I’m featured in the show as a member of the code team. Morf did some consulting for the show. Tahoe27 did some consulting and a scene for one of the episodes. Michael Butterfield did some consulting and writing for the show (one of his articles is posted on the History Channel site).
The pivots will be famous now. 
Does anybody have a z340 font that I can put into Excel by any chance? I would like to show symbols instead of numbers some times. Thanks.
Yes, I have. A .ttf file is included in my peek-a-boo tool in the folder "fonts". It maps to my default 340 transcription.
Wow, Largo, this is really great! Do you have one for Z408 as well?
I adapted it to the web: http://zodiackillerciphers.com/z340-font/z340.html Does it look ok in your browser? I really like that copying and pasting works (the transcription symbols are preserved).
Do you mind if I promote the font on my web site? And link to the download?
Wow, Largo, this is really great! Do you have one for Z408 as well?
I am glad that you like the font. I have one for z408 too, but I have not used it for a long time. So I am not sure if it matches 1:1.
https://www.dropbox.com/s/m6ttx1hhrzgsl82/z408.ttf?dl=0
Does it look ok in your browser?
The font looks nice in my browser (I have tested with Safari and Google Chrome on macOS, Firefox on Windows). Of course you can use the font for your website. But better put it to your webspace instead linking to my dropbox link. I’m thinking about switching to another cloud-service.
Looks like a symbol is missing in the z408 font :/
I think I’ll be able to fix this the next week.
Looks like a symbol is missing in the z408 font :/
I think I’ll be able to fix this the next week.
I could not locate any missing symbols – they seem to be all accounted for.
Compare to:
May I ask – What program do you use to create and edit the fonts?
May I ask – What program do you use to create and edit the fonts?
https://itunes.apple.com/de/app/ifontma … 81670?mt=8
The only disadvantage: Now my handwriting is public 
I could not locate any missing symbols – they seem to be all accounted for.
I couldn’t either but what does the last symbol in your list represent?
“I don’t know Chief, he’s very smart or very dumb.“
Direct download: https://www.dropbox.com/s/2ypfvap4fs96n … n.ttf?dl=0
It uses a-z, A-Z, 0-9, +-:;
Wow, thanks I will check that out!
Alberti / Caesar shift explanation for symbols that are mutually exclusive to the top and bottom 6 rows?
I will be posting this weekend about the possibility of an Alberti / Caesar shift explanation for the symbols that only appear in the top and bottom half of the message. I have a new spreadsheet that I can put an entire novel into, break down into chunks of 340, and encode whatever parts of the chunks with Caesar shifts that I want to see what happens to the frequency of the resulting symbols, etc.
Here is the 340, spreadsheet version with numbers instead of symbols, showing the symbols. There are 39 exclusive positions in the top and bottom, and only 4 in the middle.
The idea is that these could be created by the following cipher:
1. Transpose the plaintext
2. Encode the plaintext, top and bottom areas with one Caesar shift, and the middle with another Caesar shift, symbols look just like ordinary letters
3. Encode again with homophonic symbols
A couple of questions that need to be addressed.
Could this type of cipher result in 39 exclusive symbol positions in the top and bottom but only 4 in the middle? The answer is yes, depending on the plaintext, and one Caesar rotation of 25 possible in particular results in a much larger discrepancy than the other 24 possible rotations.
Could this type of cipher result in so many P19 repeats? I haven’t gotten that far yet, but based on my data, the answer is yes.
I put Brave New World in my spreadsheet and encoded the whole thing this way to see what would happen. More to come. Spoiler alert, however, there is probably only a small chance that this is the actual cipher that Zodiac used. But I will run through it anyway and make a cryptogram.
