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Re: using Skype, hosted voip, etc. in SMB
From: "Morgan Reed" <morgan.s.reed () gmail com>
Date: Wed, 26 Jul 2006 13:57:26 +1000

On 7/26/06, Dragos Ruiu <dr () kyx net> wrote:
On July 25, 2006 06:14 am, Morgan Reed wrote:
> The guys at http://www.rstack.org have done quite a bit of work on
> Skype (and more particularly Skype security), the Chinese DIDN'T
> "crack" the Skype protocol they were simply the first people to
> release an alternative client.
>
> Rstack.org's were the first to "crack" the protocol, the details can
> be found in  Philippe Biondi's and Fabrice Desclaux's blackhat
> briefings eu 2006 presentation "Silver Needle in Skype";
> http://www.blackhat.com/presentations/bh-europe-06/bh-eu-06-biondi/bh-eu-06
>-biondi-up.pdf
>
> Further work was done later into Skype-based botnets, details are
> available in Cedric Blancher's "Fire in the Skype" presentation;
> http://sid.rstack.org/pres/0606_Recon_Skype_Botnet.pdf
>

Actully not to belittle team RStack (hi guys, and girls) and their work
but the first analysis I saw of the Skype protocol was the 2004
paper from Salman A. Baset and Henning Shulzrinne at the
CS dept. of Columbia University. This paper started a lot of
other research.

Just to give credit where credit is due.

cheers,
--dr


Yes I agree credit where credit is due, the work in the paper from
Salman A. Baset and Henning Shulzrinne is quite exceptional and was
the catalyst for much further research it only provides a partial
reversal of the protocol.
http://www1.cs.columbia.edu/~library/TR-repository/reports/reports-2004/cucs-039-04.pdf

The reason I credited RStack with "cracking" the protocol is because
(to the best of my knowledge) they were the first to provide a full
reversal of the protocol.

Further to the original question there is also a product
(interestingly enough it was released shortly after the Black Hat
Briefings Europe 2006) called Uplink which acts as a Skype to SIP
adapter which may also prove useful.

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