Zhou Shijie

Adaptive Flooding Routing Algorithm in Unstructured P2P

Flooding is widely used in unstructured peer to peer (P2P) systems, such as Gnutella. Although it is effective in content search, flooding among peers or super-peers causes large volume of unnecessary traffic. To address this problem, we propose an efficient and adaptive search mechanism, adaptive flooding routing algorithm (AFRA). AFRA provides the flexibility to adaptively adjust the number of relay neighbors and TTL value to meet different performance requirements. The effectiveness of AFRA is demonstrated through simulation studies. Primary experimental results show that our new AFRA solution reduces about 65% of the flooding messages while maintaining the acceptable high searching quality

Cost-based intelligent intrusion detection and response: design and implement

A flexible intrusion detection and response system (ID&R) needs to maximize security while minimizing cost and making response automatically. CI/sup 2/D&R, the cost-based intelligent intrusion detection and response system, is proposed, which is originally developed as a facility to deal with network-based attacks and to make effective response automatically and intelligently. The networking environment deployed with the CI/sup 2/D&R consists of two major parts: guard, which runs on the specific guarded host (GH), and spy, which runs in guarded network (GN). The components of the CI/sup 2/D&R are introduced, which include intrusion detection, attack classification, damage analysis, attack path rebuilding, resources automatically safeguarding, calamity recovery, and security officer. The several kinds of data flow in CI/sup 2/D&R are discussed, too. While CI/sup 2/&R is only a prototype, some experimental results are also presented.

CI 2 D&R: Cost-based Intelligent Intrusion Detection and Response System

Intrusion detection and response system (ID&R) need to maximize security while minimizing cost and taking response automatically. CI/sup 2/D&R, the Cost-based Intelligent Intrusion Detection and Response System, is originally developed as facilities for deal with network-based attacks automatically and intelligently. This paper provides an overview of CI/sup 2/D&R architecture. The primary components of CI/sup 2/D&R and their functions are also probed into. What is more, the data flow of CI/sup 2/D&R is discussed and compared. Finally, the related work is touched on and conclusions are drawn.

An Experimental Study of the Active Recommendation Mechanism Based Distributed Approximate Indexing in Unstructured P2P Networks

In unstructured P2P systems, it is hard to find the desired files without distributing queries, since there is neither a centralized directory nor any precise control over the network topology or file placement. Many valuable efforts have been done towards improving search efficiency and increasing the scalability of unstructured P2P systems while guaranteeing endurable resource consumptions. In this paper, we purpose an Active Recommendation Mechanism (ARM) which aims to provide efficient searching services and enhance benign competitions in P2P networks. We also build a two-tier proxy architecture consisting of reputation evaluating proxies and content indexing proxies. Based on the ARM and the new architecture, we purpose a Distributed Approximate Indexing (DAI) method to support an efficient search without the need for a single centralized index host.