Confidentiality is an element of security that makes information available only to authorized entities. Confidentiality ensures the privacy of a communication so that information can be read only by persons authorized to do so. Authentication is an element of security that provides the means to verify the identity of entities participating in a communication or to verify the origin of a document. Non-repudiation is an element of security that provides proof of transmission and receipt. It ensures that parties involved in a transaction cannot deny their role in the exchange.
Identification is a different business process from, and take place prior to, authentication.
The level of assurance that a person is who they say they are is stronger for some forms of identification than for others. Appearing in person before issuer or trusted third party and providing one or more previously issued means of identification. May require picture id. Authentication is the process of determining if an individual requesting access to computer applications is who they say they are, and if that individual is recognized by the computer system as a valid user. Authentication does not grant or deny access to applications.