[VOIPSEC] VoIP Spam paper

[vatsala bisht]

Hi Vijay,
It is a good effort to combine the various previously
known components to solve the SPIT problem. 

For example, the importance of "call duration" was
realized and used to solve the SPIT by Hemant Sengar
and he put a white paper on March 2007 (publicly
available at www.vodasec.com) where he observed the
average call durations are of few minutes and raised a
question that for a normal user how many calls can be
made within a short observation duration.

Similarly, the "directionality" of spam calls are
observed and discussed (I suppose in 2006) in Blocking
Spam in Enterprise IP Telephony Networks by D
Vinokurov (ALCATEL).

However, I find the new idea of developing rankings by
using Eigentrust. Still, I am not sure how the
solution tackles the problem of "Byzentine Failures". 

Hope my comments will be helpful.

Thanks.

--- vijay arvind <vijay.arvind at gmail.com> wrote:

> Hello All,
> 
> Attached is a link to a VoIP spam approach that we
> at the Georgia Tech
> Information Security center (GTISC) are working on
> and was presented at the
> 4th conference of Email and Anti Spam:
> http://www.ceas.cc/2007/papers/paper-63.pdfs
> 
> The basic idea is to try and exploit the fact that
> in regular communication
> users both make and receive calls, while spammers
> are interested in only
> making calls and disseminating information. Users
> rarely call a spammer and
> even if they inadvertently do so, the call will last
> for a small duration.
> Hence we use call duration and the directionality of
> calling patterns to
> distinguish between a regular user and a spammer. We
> use basic cryptographic
> primitives to encapsulate call duration as call
> credentials. How we combine
> these call credentials using social networking
> theory and the Eigentrust
> algorithm (PageRank) to create a spammer detecting
> mechanism forms the crux
> of the paper.
> 
> Bouquets and Brickbats are most welcome.
> 
> Thanks,
> Vijay
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> Voipsec at voipsa.org
>
http://voipsa.org/mailman/listinfo/voipsec_voipsa.org
> 



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