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Re: VMs: Cardan grille
Hello, pls correct the previous this way:
1) The cryptographer did not find the quoted text on my page, rather my error there :-),
since I described Fleissner grille working as Cardan grille.
2) Instead "seismographical", pls read "steganographical", my speller likes to play tricks on me and offers me some weird options when I am not watching.
======= You wrote:
>I was just informed by one cryptographer-lecturer about one thing I did not know -
>actually he found that on my page. You might be aware of it, but it may require further
>study and brigs rather bad news, I quote:
>"Cardan grill is different from special grill called Fleissner-Wustrovitz, where the grill is
>designed such way it can be rotated and eventually all places are filled with valid
>letters, therefore it is a kind of transposition cipher.
>Cardan grille is a seismographical method that brakes the mutual bonds and deforms the
>statistics. We take say the matrix 15x15 and cut-out randomly not more then quarter
>openings. The grill is then used such way that we write plaintext into the openings (in
>forward or backward direction). It is not rotated but put away and remaining spaces
>are filled with nulls (random, not valid letters). That makes all statistics and cracking
>methods useless, including bigraphs. The solution is possible only when the same grill
>is used many times and the text is long enough."
>It is my impression that Rugg is not using the true Cardan grill, since he is just juggling
>pre-, mid- a suffixes, not individual letters. It also brings for us very difficult point to
>overcome: using of the true Cardan grill will provide the text which is 75 percent
>"gibberish"! Such text cannot be handled by statistical nor by grammatical methods.
>The repetitions of signs are irregular and I wonder what can be said about Zip's laws
>and second entropy of such text, provided that even the spaces between words ( or
>rather "packets") are put in by random.
>I even suspect Cardan designed his grill as "almost unbreakable" cipher and may even
>warn its users against repeated use of it. The author of the VM could know that and use
>different grill for each page - the key being hidden in the picture on the same page. That
>would make solution extremely difficult, but still possible - if we find those keys :-). On
> the other hand, that would explain few points: the lack of longer words, difficulties of
>our linguists as well as cryptographers, the strangeness of the pictures, etc.
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