Re: VMs: Cardan Grille

[tyoung1@xxxxxxxxxxxx]

Cardan Grilles:

Cardan Grilles were used to hide messages inside other messages.  Two people would agree on the layout of the grill.  Basically, they would take a rigid piece of paper and cut squares in it.  One would then write a message in those squares; one letter per square.  The next step was to remove the grill and fill in the remaining white space with random letters.  If you were good, you could fill in the white space with meaningful text.  Now, the recipient, to read the message, would place his/her copy of the grill over the text revealing its true meaning.

Here are some examples:
http://www.jura.ch/lcp/cours/dm/codage/stegano/cardan.html

It is in french, but the interactive examples still show you what is going on.

Basically, Mr. Rugg is using the grille in "reverse" of its original intention.

Ted Young

----- Original Message -----
From: Rene Zandbergen <r_zandbergen@xxxxxxxxx>
Date: Wednesday, January 7, 2004 2:41 am
Subject: Re: VMs: Cardan Grille

> 
> --- tyoung1@xxxxxxxxxxxx wrote:
> > I have been reading through the archives of this
> > list to catch up.  I noticed that Gordon Rugg posted
> > his findings on the subject back in the beginning of
> > December, before his article.  You can review the
> > original thread here:
> 
> Yes. My question, however, was not how Gordon is
> using the Cardan grille, but how it was 
> _typically_ used (assuming that it was typically
> used :-) ).
> 
> Cheers, Rene 
> 
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