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Intrusion Detection: Tools, Techniques and Strategies

Intrusion detection is an important aspect of modern cyber-enabled infrastructure in identifying threats to digital assets. Intrusion detection encompasses tools, techniques and strategies to recognize evolving threats thereby contributing to a secure and trustworthy computing framework. There are two primary intrusion detection paradigms, signature pattern matching and anomaly detection. The paradigm of signature pattern matching encompasses the identification of known threat sequences of causal events and matching it to incoming events. If the pattern of incoming events matches the signature of an attack there is a positive match which can be labeled for further processing of countermeasures. The paradigm of anomaly detection is based on the premise that an attack signature is unknown. Events can deviate from normal digital behavior or can inadvertently give out information in normal event processing. These stochastic events have to be evaluated by variety of techniques such as artificial intelligence, prediction models etc. before identifying potential threats to the digital assets in a cyber-enabled system. Once a pattern is identified in the evaluation process after excluding false positives and negative this pattern can be classified as a signature pattern. This paper highlights a setup in an educational environment to effectively flag threats to the digital assets in the system using an intrusion detection framework. Intrusion detection framework comes in two primary formats a network intrusion detection system and a host intrusion detection system. In this paper we identify different publicly available tools of intrusion detection and their effectiveness in a test environment. This paper also looks at the mix of tools that can be deployed to effectively flag threats as they evolve. The effect of encryption in such setup and threat identification with encryption is also studied.