bugtraq - Re: base64

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Date: Thu, 25 Sep 2003 18:46:36 -0500
From: Earl Hood <earl@...lhood.com>
To: bugtraq@...urityfocus.com
Cc: MightyE <trash@...htye.org>, Lawrence MacIntyre <lpz@...l.gov>
Subject: Re: base64


On September 25, 2003 at 11:30, Bennett Todd wrote:

> There's a third method, which I think is rather better than either
> of those.
> 
> You can re-code everything into a canonical form. Some email client
> drop some punctuation characters in filenames? Delete all such
> characters from filenames. Different tools handle various i18n
> encoded filenames differently? Map to US-ASCII. Enforce length
> limits. Recode base64. Recode uuencoded chunks. Regularize
> non-standard MIME.

You cannot do this for signed messages, therefore, you still
need to either decode in all possible ways or drop the message
(or the offending entity).

--ewh