Re: Stream cipher against block cipher
From: Andrew Swallow (am.swallow_at_eatspam.btinternet.com)
Date: 06/30/03
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Date: Mon, 30 Jun 2003 00:15:15 +0000 (UTC)
"Tom St Denis" <tomstdenis@iahu.ca> wrote in message
news:tuhLa.7413$x4o.3755@news04.bloor.is.net.cable.rogers.com...
> Douglas A. Gwyn wrote:
> > AE wrote:
> >
> >> This doesn't make a block cipher.
> >
> >
> > Sure it does. What do *you* think the definition of
> > "block cipher" is?
>
> Block ciphers are time invariant. Stream ciphers are not.
>
> e.g. no matter how many times I encrypt P I should get the same output
> which is not true of a decent stream cipher.
>
When using a stream cipher as a block cipher reset the IV and
counter when repeating the encryption.
Andrew Swallow
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