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The Zodiac Ciphers


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#1 Tom Henrik

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Posted 28 February 2007 - 03:34 PM

I was reading about the movie Dirty Harry on Wikipedia yesterday, and noticed that the criminal in the movie (Scorpio) was inspired by a real serial killer from the 60's-70's called the Zodiac.

I had never heard about this killer before, so I read a little just to get some more understanding about how he had inspired the character Scorpio.

That's when I discovered something interesting. This killer had sent a lot of letters containing cryptograms to several newspapers and police stations, telling them that his identity was hidden in these. The three first cryptograms proved too difficult for code experts to crack, but not for a school teacher and his wife. They managed to crack the code one week after it had been released.

However, there are still three ciphers that to this date have not been solved. So if you like a good challenge, why not give it a go?

I love these kind of riddles, myself. Those of you that follow the online comic Order of the Stick are probably aware that Haley was speaking in ciphers for a long while.

If you are interested in twisting your brain a little, you can find all of the ciphers here.

And to create a bit more use for this topic, what kind of Brain Twisters do you like? Do you have a particular strategy for solving puzzles? Or have you maybe created a code that no-one has yet cracked?

Please share your experience, and if you have a go at the Zodiac ciphers, please post about your progress :)

My own approach to ciphers is that I begin by first counting all the characters used in the text. This is to determine if one character equals a single letter, or if there is irregularities. For example, if there are 40 characters in the text, it is obvious that several characters replace a single letter. I then start to look for characters that stand next to eachother, as there is a good chance that these characters (and only these) replace a single letter. After that I start looking for character patterns, to determine if there are any. For instance, in the first three Zodiac ciphers the letter O had been encrypted with the following characters: X, I, T, and a reverse D. So that in the text, the first O would be written as X. The second would be written as an I, the third as a T, the fourth would be a reverse D, and the fifth would be an X again.


I am working on this one at the moment. It consist of 63-65 characters, so it should have some serious character patterns.

So far I belive that I have discovered four letter patterns, all single characters.

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#2 greywolf

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Posted 28 February 2007 - 07:28 PM

What!? Haley speaks in ciphers!? How do I decode it? :0

#3 Doubler

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Posted 28 February 2007 - 08:28 PM

Quote

so it should have some serious character patterns
Shouldn't that be 'could'? Not every cypher always has a symbol-for-symbol translation.
The patterns could lie much further 'down' then the characters :)

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#4 Tom Henrik

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Posted 28 February 2007 - 10:05 PM

She spoke in ciphers. The way to decode it is to find out what each letter means.

Excellent cipher page

Translated she is saying:

"NALE?? I kissed Nale? Ugh!!"
"Woooooo! Kick his *money-maker*, Oddly Effective Elan!"
"Huh?"
"You've got to be kidding me. Elan, you're not buying this are you???"
"Damn straight, he's lying!"
"He bought me this dress! Come on, would ANY woman CHOOSE to wear this thing?"
"No! I'm not! I'm stupid! I'm so stupid!"
"Of course not! This is absurd! I'm Chaotic Good! Ish!"
"Why are you listening to him?? He's the VILLAIN!"
"No, I haven't!"
"You have to believe me! He's lying!!"
"What?? No! NO!!"
"I can't..."
"...think..."
"I-I thought..."
"I thought-"

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#5 Doubler

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Posted 28 February 2007 - 10:31 PM

The thing is, not every cipher actually has every same letter always change into the same thing.

One P might at be a symbol ^, another P ` and a later P B or something ;)

I mean, those are still ciphers, right? A cipher depends on a pattern somewhere, not necessarily directly in the letters themselves, which ultimately can lead to tracing back from the new symbols to their original meaning if you know or can discover this pattern. If you know the original language, simple letter-shifting is actually rather easy to solve by that method you just described in various iterations :)

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#6 Tom Henrik

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Posted 28 February 2007 - 10:35 PM

That's correct, Doubler. That's a cipher too :)

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#7 Doubler

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Posted 28 February 2007 - 10:36 PM

And seeing as that's possible, and assuming such a differentiation might not actually be spatial, character patterns might not actually occur? At least, that's what I proposed.

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#8 Blood-Pigggy

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Posted 28 February 2007 - 10:43 PM

You didn't know the Zodiac killer?

Also there's a movie coming out about him in a few days called Zodiac.

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#9 Tom Henrik

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Posted 28 February 2007 - 10:53 PM

View PostDoubler, on Feb 28 2007, 11:36 PM, said:

And seeing as that's possible, and assuming such a differentiation might not actually be spatial, character patterns might not actually occur? At least, that's what I proposed.

That's a possibility, of course, but you gotta start looking for a system somewhere :)

@Pigggy
Norway is a long way from where the Zodiac operated, and this was in the late 60's. ;)

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#10 Blood-Pigggy

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Posted 28 February 2007 - 11:55 PM

The Zodiac wasn't a doctor.

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#11 Tom Henrik

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Posted 28 February 2007 - 11:57 PM

For all we know, he might've been :)

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#12 Blood-Pigggy

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Posted 01 March 2007 - 12:12 AM

Well he sucked anyway.

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#13 DakaSha

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Posted 01 March 2007 - 12:30 AM

has anybody ever taken into account that some of the ciphers of this zodiac *twiggy* could be bogus?

i mean anybody who kills people then tells the citizens to do his bidding is not to be trusted :)

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#14 Blood-Pigggy

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Posted 01 March 2007 - 12:39 AM

I sure as hell wouldn't trust this *twiggy*.
Besides, they should have caught him by now if he sent them letters, put some fingerprints on there buddy.

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#15 greywolf

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Posted 02 March 2007 - 12:45 AM

@Tom: Ah, I see! :)