The Parkerian Hexad is a set of six security principles that build upon the original CIA Triad of Confidentiality, Integrity, and Availability. The three additional principles are control/possession, authenticity, and utility.

Control/possession is the principle of ensuring that only those with the appropriate authority are able to access and control information and systems. This can be done through access controls such as user authentication and authorization.

Authenticity is the principle of ensuring that data and transactions are from their claimed source^[0]. This can be done through encryption, digital signatures, and other methods to ensure data is from the intended source.

Utility is the principle of ensuring that information is useful^[1] and understandable. For example, otherwise secure information, if encrypted with a lost decryption key would not be said to have utility.

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