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One of the basic themes of IA is that it is composed of three principles - which have the memorable acronym CIA. C = confidentiality: only those who should be able to see the data can see it. I = integrity: the data is only changed by those authorized to change it and is not being corrupted accidentally or intentionally. A = availability: users can access the data when they want to or need to.

Attacks against availability include denial of service (DoS) attacks which tie up resources and bog down networks to the point that legitimate users are not able to access them. Availability is also attacked by anything that causes the computer or the networks that provide access to it to crash. Availability is protected in IA through various methods including (but not limited to) redundancy, rerouting, disaster recovery plans, and contingency planning.

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