Full Disclosure mailing list archives

Re: Encoding

From: "Maxime Ducharme" <mducharme () cybergeneration com>
Date: Fri, 30 Apr 2004 14:27:18 -0400

Encoding
Hi,
    text/* encoding can be read in you mail program
or any text editor.

Base64 is used to encode binary data in string so it can
get trought normal SMTP servers.

To get the binary file back, you must decode it with a base64
algorithm which is well known.

You may get info on this encoding here :
http://www.ietf.org/rfc/rfc1341.txt
(section 5.2  Base64 Content-Transfer-Encoding)

Here is an already compiled tool :
http://www.fourmilab.ch/webtools/base64/
(this one runs *nix & windows)

Have a nice day

Maxime Ducharme
Programmeur / Spécialiste en sécurité réseau

----- Original Message ----- 
From: Tyler, Grayling
To: full-disclosure () lists netsys com
Sent: Friday, April 30, 2004 1:35 PM
Subject: [Full-disclosure] Encoding


At the risk of getting flamed (it will be worth it if I learn something
useful) I'd like to ask a question.
I've seen several cases where files have been sent to the list using
different encodings (examples below). How do you covert these back to the
original files (or can you?)
Thanks
<snip Examples>
This is a multi-part message in MIME format.
--Multipart_Thu__29_Apr_2004_20:59:33_+0000_08324880
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
----------ecnaowrkveaupymubjrq
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: 7bit
<html><body>
<br>
</body></html>
----------ecnaowrkveaupymubjrq
Content-Type: application/octet-stream; name="Joke.scr"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Joke.scr"
TVoAAAEAAAACAAAA//8AAEAAAAAAAAAAQAAAAAAAAAC0TM0hAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAkAAAAKkm3RPtR7NA7UezQO1Hs0DtR7NA7kezQGNYoEBtR7NAEWehQOxHs0AqQbVA
7EezQFJpY2jtR7NAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAUEUAAEwBAwDMD5BAAAAAAAAA
.
.
many more lines of same
.
.
.
AADgAA8BCwEFDABQAAAAEAAAAJAAAPDiAAAAoAAAAPAAAAAAQAAAEAAAAAIAAAQAAAAAAAAA
BAAAAAAAAAAAAAEAABAAAAAAAAACAAAAAAAQAAAQAAAAABAAABAAAAAAAAAQAAAAAAAAAAAA
kEw1CmBDYI4AF8SdSkyDJnqksmHAHk8NPooaF603JIi2SDa8FMRlOlq2AbtbElqqTJUFFmaX
DZ2kJ7wnUkc=
----------ecnaowrkveaupymubjrq-- 


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Current thread:

Encoding Tyler, Grayling (Apr 30)
- Re: Encoding Maxime Ducharme (Apr 30)
  - Re: Encoding Exibar (Apr 30)
    - Re: Encoding Maxime Ducharme (Apr 30)
- <Possible follow-ups>
- re: Encoding Willem Koenings (Apr 30)