International Association of Scientific Innovation and Research (IASIR)
In this paper, the authors contain a comprehensive survey of some modern and most popular intrusion detection techniques. It is unrealistic to prevent security breaches completely using the existing security technologies. IDS (Intrusion Detection System) play an important role in network security. Most of the current intrusion detection systems are signature based systems. Signature based IDS also known as misuse detection looks for a specific signature to match, signaling an intrusion. Provided with the signatures or patterns they can detect many or all known attack patterns but they are of little use for as yet unknown attacks.