Mitigating distributed denial of service attacks in multiparty applications in the presence of clock drifts

This is a network based application, while transferring file from client to server attackers may hack the files. Internet grows rapidly since it was created. With this network, users can share their information. The use of such networks had a tremendous growth. Meanwhile, attacks to such networks also have increased. There are several types of such attacks. An attacker can possibly launch a DoS attack by studying the flow or path of network. Earlier solutions for this problem are based on port-hopping between single pair of processes which are synchronous. Adversaries have the ability to identify open ports and launch directed attacks to those ports. This problem is named as Port-Hopping. The Solution proposed in this paper extend port-hopping to support multiparty applications. The server communicate with multiple clients in a port-hopping manner without the need for group synchronization. The solutions are simple, based on each client interacting with the server independently of the other clients, without the need of acknowledgments or time server.