Security Risk Analysis in Peer 2 Peer System; An Approach towards   Surmounting Security Challenges
  P2P networking has become a promising technology and has achieved popularity as a mechanism for users to share files without the need for centralized servers. The rapid growth of P2P networks beginning with Kaza, Lime wire, Napsters, E-donkey, Gnutella etc makes them an attractive target to the creators of viruses and other security threats. This paper describes the major security issues on P2P networks (Viruses and worms) and presents the study of propagation mechanisms. In particular, the paper explores different P2P viruses and worms, their propagation methodology, outlines the challenges, and evaluates how P2P worms affect the network. The experimental results obtained will provide new direction in surmounting the security concerns in P2P Networks 
Mansoor Ebrahim, Shujaat Khan, and UmerBin Khalid
cs.CR