Abstract: In a Peer to Peer network, the involved nodes are considered as peers and these peers link with other neighboring peers directly to achieve the assigned task. It usually involves heterogeneous networks. Due to the network topology and features, this network is prone to several attacks and the security features available are relatively minimal. Thus, this network suffers from various attacks. In this study, we develop an attack prevention protocol based on the reputation aggregation and cryptographic message hiding technique. The reputation aggregation is performed based on the differential gossiping algorithm and the cryptographic message hiding technique is based on the cryptographic puzzle hiding scheme. This way, the network operation is secured and thus, it performs efficiently.