Abstract—Becoming more competitive and more effective in the current scenes of Business and Public Administration, the organizations must be able to approach easily and quickly to the information on the customers and the external conditions of market. In other words it means to head at the improvement of the Decision Support Systems. Decision Support System is concerned with developing systems aimed at helping decision makers solve problems and make decisions. In this paper, we refer to a decision support system based on flexible architecture able to discover the knowledge in a distributed and heterogeneous multi-organization environment. The system architecture has been designed according to the Service Oriented Architecture and Model View Controller design pattern. Moreover it is based on a mining engine whose purpose is to generate and to use suitable e-services for knowledge by driving the user through various stages of the Knowledge Discovery process. An Intrusion Detection application is also described. Index Terms—data mining, web mining, intrusion detection, mining engine, flexible architecture, knowledge discovery, decision support system. I.

Los Angeles, in 1976 and 1979, respectively. His research interests include formal specification and verification of systems, computer system security and reliability, programming and

Computer viruses have been around almost as long as computers. Latest technical development such as high speed network, internet & advance personal computers have provided viruses a main threat to the computers. I remember the story of elephant and ant and how the ant brought the mighty elephant down on its knees? Similarly, a computer virus, a few KBs in size, like any piece of code, which when executed on computer, carries out a particular task, can destroy gigabytes of data stored in computer and bring the biggest organization to a halt. A lot of anti-virus software is available in the market and being widely used but these anti-viruses are less effective as they are made only for the existing viruses not for the viruses which developed latter. So this paper mainly concentrates on analyzing the procedures which is being used for preventing virus. Then it covers what strategy should be adopted for anti-virus and how to recover the computer from a virus attack. This paper also describes the identification & classification of computer virus, and current computer virus situation. Keywords: malware, Trojan horses, arsonists, and Nessus.

The administrator of an enterprise network has a responsibility to enforce the policies on the network. Yet, most security mechanisms do not map well to the intended policies. This has been due to the prevalence of simplistic tools that have poor enforcement but, yet are easy to manage. While advanced commercial solutions do exist that have stronger enforcement, they are significantly harder to manage. To that end, we propose Lockdown, a policy-oriented security approach that builds on the concept of local context to deliver a lighter weight approach to enterprise network security while striking a balance between the level of enforcement and level of management available to the network administrator. In this paper, we describe how the Lockdown approach streamlines the process of network security management from network auditing to visualization to policy mapping to enforcement to validation. We demonstrate the strength of Lockdown through detailed assessments of an enterprise university network to show how local context significantly improves network management for the system administrator.