[C] data confidentiality

Assurance that the information is accessible only to those who are authorised to have access.

What would be the importance of the data becoming known to unauthorised persons?

Data are attributed a high value from the confidentiality point of view when their disclosure would cause serious damage to the organisation.

Likewise, data have no appreciable value from the point of view of confidentiality when their becoming known to anyone is of no concern.