To Detect and Recover the Authorized Cli- Ent by Using Adaptive Algorithm

Computer Network is collection of computers and other hardware components interconnected by communication channels that allow sharing of information. Network security consists of the provisions and policies adopted by a network administrator to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and Network-accessible resources. Network security involves the authorization of access to data in a network, which is controlled by the network administrator. Distributed denial-of-service attack (DDoS attack) is an attempt to make a machine or network resource unavailable to its intended users. The previous work, one is acknowledgment-based and the other one depends on synchronized clocks. Acknowledgment loss can cause a situation where a port may remain open for a time interval long enough for an eavesdropping attacker to identify and launch a directed attack to it. In proposed System an adaptive algorithm, HOPERAA, for enabling hopping in the presence of bounded asynchrony, namely, when the communicating parties have clocks with clock drifts. 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. There are many network based solutions against DDoS attacks. These solutions usually use routers or overlay networks to filter malicious traffic. Keywords-Distributed Denial of Service, Bigwheel Algorithm, Adaptive Algorithm.