The "CIA triad" definition of security (Confidentiality, Integrity, and Availability ) is most often violated by loss of the Availability component. Very often

The "CIA triad" definition of security (Confidentiality, Integrity, and Availability ) is most often violated by loss of the Availability component. Very often by "security" mechanisms that effectively serve as a Denial of Service attack on the users. A system which is easy to use securely will stay secure, a system which is difficult to use securely will be insecure.