Which type of data protection guarantees that a statement cannot be denied?

Nonrepudiation is the concept that ensures a statement or action cannot be denied. This is often critical in legal and transactional contexts, where it is important to affirm that an action or communication occurred and that the parties involved cannot later refute their involvement or the authenticity of the statement. Nonrepudiation is typically enforced through mechanisms such as digital signatures, secure logs, and other forms of proof that provide evidence of the integrity and origin of a message or transaction.

In comparison, confidentiality relates to protecting information from unauthorized access, ensuring that sensitive data remains private. Integrity pertains to maintaining the accuracy and consistency of data, ensuring it remains unaltered except by authorized individuals. Access controls are security measures that restrict entry to systems or information based on permissions, but they do not inherently provide the assurance that an entity cannot deny their actions.

By guaranteeing that a statement cannot be denied, nonrepudiation serves as a crucial element in cybersecurity practices, particularly in transactions, communications, and record-keeping where accountability is paramount.