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Article #1884

Re: Attack Methods

#1884
From: Larry Loen
Date: Wed, 18 Nov 1992 21:17
23 lines
1857 bytes
In article I wrote:

>Now, in the ordinary course of business, there will be several messages
>of the same length.  There may well be unique messages that have no
>one of the same length, but we start with those of the same length.  
>What follows will tend to work even if the length of the real texts vary;
>the only issue of interest is that the overall length is the same and that
>the transposition step is performed _after_ the padding.

It would have been better written as:

"Now, in the ordinary course of business, there will be several messages
of the same length which share the same cipher key.  In a real, working
example, it is impractical for all messages to have their own key.
There may well be unique messages that have no other message
with the same length, but we start with those of the same length.  
What follows will tend to work even if the length of the real texts vary;
the only issue of interest is that the overall length is the same and that
the transposition step is performed _after_ the padding."

-- 
   Larry W. Loen        |  My Opinions are decidedly my own, so please
                        |  do not attribute them to my employer
Technical Details
Message-ID: <1992Nov18.211712.25453@rchland.ibm.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!newsgate.watson.ibm.com!yktnews!admin!wo0z!lwloen
References: <1992Nov11.213535.17788@csc.ti.com> <1992Nov18.134243.24089@qiclab.scn.rain.com> <1992Nov18.190513.10997@cis.uab.edu> <1992Nov18.203413.11509@rchland.ibm.com>

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Newsgroups: sci.crypt
Path: arc1-ca.pugleaf.net!sparky!uunet!newsgate.watson.ibm.com!yktnews!admin!wo0z!lwloen
From: lwloen@rchland.vnet.ibm.com (Larry Loen)
Subject: Re: Attack Methods
Sender: news@rchland.ibm.com
Message-ID: <1992Nov18.211712.25453@rchland.ibm.com>
Date: Wed, 18 Nov 1992 21:17:12 GMT
Reply-To: lwloen@vnet.ibm.com
Disclaimer: This posting represents the poster's views, not necessarily those of IBM
References: <1992Nov11.213535.17788@csc.ti.com> <1992Nov18.134243.24089@qiclab.scn.rain.com> <1992Nov18.190513.10997@cis.uab.edu> <1992Nov18.203413.11509@rchland.ibm.com>
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