Availability
The availability principle states that if an authorized individual makes a request for a resource or information, it should be available without any disruption. For example, a person wants to download his bank account statement using an online banking facility. For some reason, the bank's website is down and the person is unable to access it. In this case, the availability is affected as the person is unable to make a transaction on the bank's website. From an information security perspective, availability is as important as confidentiality and integrity. For any reason, if the requested data isn't available within time, it could cause severe tangible or intangible impact.
Common attacks on availability include the following: ...
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