Re: :::Small AES question:::

From: Suomy Nona (anon@ym.ous)
Date: 03/10/03 

Date: Mon, 10 Mar 2003 13:06:55 +0000
From: Suomy Nona <anon@ym.ous>

Pathos wrote:
> I'm not looking so much for an answer as i'm looking for a reference, a
> link, a pdf, whatever.
> I'm making my own implementation of AES with CBC mode, and i can't see
> anywhere(maybe i missed it on the nist specs) what to do when the message is
> not, multiple of 128 bit's, 16 chars, or when it's not even even big enough
> to cover a single block, i think we zero it out, and then the CBC mode takes
> care of hidding the zeros, but i'm not sure, and most important of all i
> can't find that info on 'official' papers.
> So if someone would kindly elucidate me it'de be great.
>
> Thank you for the attention
> Pedro Azevedo
>
>

While this is not a direct answer to your question, this paper talks
about different padding schemes and their security against (a variation
of) chosen ciphertext attacks.

http://www.cs.colorado.edu/~jrblack/papers/padding.pdf

IMO the Vaudenay paper [Vau02] referenced is well worth a read, so is
Krawczyk's [Kra01].

Btw does anyone know how "Krawczyk" is to be pronounced? ;)

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