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security in P2P
From: Pratik Narang <pratik.cse.bits () gmail com>
Date: Fri, 27 Jul 2012 12:38:37 +0530

Hi all,

Consider a situation involving (only) Peer to Peer traffic in a small
or medium sized network.

Peer A does a search for file qwerty.mp3, and then starts pulling the
file, in pieces, from different Peers- B, C, D and E.

Now say Mr. C is a malicious peer, and the file at his end contains a
malware/virus/trojan etc. Or better still, Mr. C decides to target
peer A and injects a malware/trojan etc. into one of the pieces of the

As a network admin, what one may do that innocent peers like A are
protected from such situations. I need a solution involving use of
IDS/IPS with signature based and/or anomaly based detection.

Kindly do not suggest actions or measures relating to the end user.
Whatever has to be done, must be done in the network design/plan- say
use Snort or some other IDS/IPS and write rules to an Open source
firewall using the IDS/IPS for this specific scenario.

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