[31735] in bugtraq
Re: base64
daemon@ATHENA.MIT.EDU (Lothar Kimmeringer)
Wed Sep 24 12:35:37 2003
From: "Lothar Kimmeringer" <bugtraq@kimmeringer.de>
To: "BugTraq@securityfocus.com" <BugTraq@securityfocus.com>
Date: Tue, 23 Sep 2003 20:10:36 +0200
In-Reply-To: <Pine.GSO.4.58.0309231211460.16663@concept.ocis.temple.edu>
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On Tue, 23 Sep 2003 12:18:31 -0400 (EDT), Birl wrote:
>Excuse my ignorance. I tried to pook around some B64 attachements in my
>email files for an answer.
>
>
>Are you stating that an =
>
>1) should not appear in B64 at all
>2) should not appear in the middle of a line, but only at the EOLN
>3) should only appear at the end of a B64 file
See the corresponding RFC. The number of characters in a base64-coded
text must be a multiply of 4. So ='s are used if there aren't enough
characters and are added at the end of the text.
= is not a valid character inside Base64 and an encoder should stop
with an error or stops decoding.
>Answering that question could help me better determine how to write a
>procmail filter for this.
/.*=[^=]/
(untested)
Regards, Lothar
--
Lothar Kimmeringer E-Mail: mailbody@kimmeringer.de
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Always remember: The answer is forty-two, there can only be wrong
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