tailieunhanh - NETWORK INTRUSION DETECTION

The birth of the interne takes place in 1969 when Advanced Research Projects Agency Network (ARPANet) is commissioned by the department of defense (DOD) for research in networking. The ARPANET is a success from the very beginning. Although originally designed to allow scientists to share data and access remote computers, e‐mail quickly becomes the most popular application. The ARPANET becomes a high‐speed digital post office as people use it to collaborate on research projects and discuss topics of various interests. The InterNetworking Working Group becomes the first of several standards‐setting entities to govern the growing network [10]. Vinton Cerf is elected the first chairman of the INWG, and later becomes known as a "Father of the Internet." [10] In the 1980s, Bob Kahn and Vinton Cerf are key members of a team that create TCP/IP, the common language of all Internet computers. For the first time the loose collection of networks which made up the ARPANET is seen as an "Internet", and the Internet as we know it today is born. The mid‐80s marks a boom in the personal computer and . | Network Intrusion Detection Intrusion detection is a new retrofit approach for providing a sense of security in existing computers and data networks while allowing them to operate in their current open mode. Biswanath Mukherjee L. Todd Heberlein and Karl N. Levitt BISWANA TH MVKHER-JEE is an associate professor of computer science at the University of California Davis. L. TODD HEBERLEỈN is a postgraduate researcher in the Computer Science Department at uc Davis. KARL N. LEVITT is a professor of computer science at uc Davis. Authentication is the process of determining whether or not an activity is a genuine one. It is a very desirable security service and is an important property of a secure network or computer system. Data and communications integrity can be directly built on authentication mechanisms. Identification is the process of determining whether someone is truly the person who he says he is. Intrusion detection is a new retrofit approach for providing a sense of security in existing computers and data networks while allowing them to operate in their current open mode. The goal of intrusion detection is to identify preferably in real time unauthorized use misuse and abuse of computer systems by both system insiders and external penetrators. The intrusion detection problem is becoming a challenging task due to the proliferation of heterogeneous computer networks since the increased connectivity of computer systems gives greater access to outsiders and makes it easier for intruders to avoid identification. Intrusion detection systems IDSs are based on the beliefs that an intruder s behavior will be noticeably different from that of a legitimate user and that many unauthorized actions are detectable. Typically IDSs employ statistical anomaly and rulebased misuse models in order to detect intrusions. A number of prototype IDSs have been developed at several institutions and some of them have also been deployed on an experimental basis in operational systems. .