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European Definitions

Other International Definitions


(Cyber) attack are the activities undertaken to bypass or exploit deficiencies in a system's security mechanisms. [1]

By a direct attack on a system they exploit deficiencies in the underlying algorithms, principles, or properties of a security mechanism. Indirect attacks are performed when they bypass the mechanism, or when they make the system use the mechanism incorrectly.

National Definitions

Standard Definition

Discussion Topic

See also

Attack tree


  1. ITU Security in Telecommunications and Information Technology: An overview of issues and the deployment of existing ITU-T Recommendations for secure telecommunications, ITU-T, Geneva (2012) - ITU-T H.235.