Re: [freenet-devl] Document structure, storables, Metadata-length

[Oskar Sandberg]

On Fri, May 04, 2001 at 12:04:03PM -0500, Scott G. Miller wrote:
> > 
> > Why not?  It's exactly the same situation as putting it at the beginning
> > of the document itself, we're just moving it a few bytes earlier in
> > the message.
> Oh, you mean the key.  The key has to go absolutely first in the
> decryption/encryption, otherwise you don't have an IV and an IV is a
> requirement for a feedback cipher.

It turns out we aren't though. With the current mode, the IV cannot be
retrieved (since you need to previous block to decrypt anything). What we
are in fact doing is running an all zero IV. Since being able to restore
the key to check it is not that important anyways, I think we should move
to actually using the key as the IV (or rather the key as a single block
encrypted by itself).


-- 
'DeCSS would be fine. Where is it?'
'Here,' Montag touched his head.
'Ah,' Granger smiled and nodded.

Oskar Sandberg
[EMAIL PROTECTED]

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