Reactive methods used to prevent an exploit from successfully occurring once a threat has been detected. Intrusion Prevention Systems (IPS) commonly employ countermeasures to prevent intruders form gaining further access to a computer network. Other counter measures are patches, access control lists and malware filters.
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A countermeasure is a measure or action taken to counter or offset another one. As a general concept it implies precision, and is any technological or tactical solution or system (often for a military application) designed to prevent an undesirable outcome in the process. The first known use of the term is in 1923.
Countermeasures can refer to the following disciplinary spectrum:
- Defense
- Medicine
- Materials engineering
- Electro-magnetic engineering
- Policing
- Information technology
- Law
- Diplomatic security
- Pollution prevention
Defense countermeasures are often subdivided into "active" and "passive" countermeasures.
