Re: VMs: Crypto timeline needed (+ some thoughts)

[Gabriel Landini <G.Landini@xxxxxxxxxx>]

On Sunday 21 Dec 2003 10:05 pm, PK#01 wrote:
> I was wondering how a Fourier Transform of the VMS would look like on a
> "per character" basis. So a FFT of the VMS where <a = 1> and <every other
> character = 0>. And then for every character or combination like <iin>.
>
> But probably this has been tried already somewhere in the VMS archives?

Yes, I did something very close to what you describe (published in my 
Cryptologia article). You can find a pdf preprint at my site.
In that paper you can see what the spectral power looks like and what are the 
differences between original texts, word-scrambled and character scrambled.
(thus breaking only grammar or grammar and word structure, respectively).

I finally chose to look into space-less texts because I cannot be sure that 
the spaces code for anything or not. In the analysis of space-less text not 
only you can guess the modal token length, but you can also see the verse 
length (if in verse!) and also harmonics of the verse length.

> I've been
> looking for FFT programs, but found only some that do a FFT of a .wav file.
> An Excel macro would be ideal but I had no luck with finding that that
> either.

Excel can do FFT, but there are much better packages. For that stuff I used 
the Tisean package which you can download for free. (the executable 
you need is called spectrum.exe).

Cheers,

Gabriel


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