Re: XOR without repeated key
From: cryptokid (sci_crypt_kid_at_yahoo.com)
Date: 08/28/04
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Date: 27 Aug 2004 15:21:18 -0700
"Arthur J. O'Dwyer" <ajo@nospam.andrew.cmu.edu> wrote in message news:<Pine.LNX.4.60-041.0408270947560.1786@unix41.andrew.cmu.edu>...
> On Fri, 27 Aug 2004, Robert Spielmann wrote:
> >
> > I have to crack a simple XOR encryption, but all resources I found
> > assume that a repeated key is used to encrypt the plain data. In my
> > case, it seems that the key is exactly as long as the ciphertext. Are
> > there still ways to crack that, apart from long-term bruteforce?
>
> Of course not. And brute force doesn't work either.
> Google "one time pad". (Five minutes with pencil and paper will tell
> you why the answer is "of course not.")
>
> -Arthur
One time pad can be broken by deletion cryptanalysis:
Lars Knudsen and Fauzan Mirza -
http://www.mat.dtu.dk/people/Lars.R.Knudsen/craptology/crv0n0-1.html
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