Studying about Virus Counter Measures and Trusted Systems

Any unauthorized access into a computer system or network is one of the most serious threats to computer security, which is referred with the term Intrusion. The process of detecting the unusual patterns of activity or set of activities that are correlated with the defined list of intrusion based events is known as intrusion detection. Many systems have been designed to carry out this intrusion detection process i.e., Intrusion Detection Systems (IDS). In general they provide an early warning to the system against an intrusion and suggest a series of defensive action that can be taken to prevent or minimize the damage. Intruder or hacker or cracker is one of the major threats to system level security.