Re: VOYNICH encryption program and a cracker

["Dark MaP" <darkmap@xxxxxxxxxxx>]

> Look for Crack Voynich.  You will get a self-extract file containing a 
> cipher program called VOYNICH (in English).  It takes a text and a 
> five-digit number and enciphers the file.  In French, the instructions say 
> to run CRKVOY1.EXE , give it the file name, and it returns the five-digit 
> key.  Then you run  CRKCODE.EXE , give it the file name and the recovered 
> key, and it produces the decrypted file as  DECODE.VOY .  Two encrypted 
> texts are given as examples.
>  I certainly hadn't heard of this VOYNICH cipher before (and no, I haven't 
> tried it on the real thing).
> Dennis


The software is pretty good.
I played with it a few minutes  :-)

Who is Alexandre PUKALL? What gived him the idea from Voynich?
He uses a basic substitution/compression scheme, like a ZIP or RAR.
I don't know French but the keys are arbitrarily assigned.
Did you guess the cool of the method? The crack-program guesses the password 
by parsing the header in every "coded file". The header is ":-(" , the first 
3 bytes in an archive. The it simply needs to test every password 
posibility: it performs a Brute Force attack over itself method! haha, any 
amateur coulda do it. Hey! It includes me, I've developed a similar method 
for ciphering TEXTS (only works with DOS' .TXTs). I used a similar scheme, 
but the software is on english. Anybody with time to play and anlayze my 
method? :-) just request me the EXEs (I still didn't finished the 
remodelation of my web site :-(  )

Best wishes,

DarkMaP

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