A contractor denies approving a fraudulent wire after their account was used. Which security concept makes repudiation harder by providing reliable evidence of who authorized an action?
Select an answer to reveal the explanation.
Short Explanation
Non-repudiation is the 'you cannot shrug and say it was not me' layer — signatures and solid auth trails nail down who did what. Encrypting the amount or keeping the site up does not settle the blame game.
Full Explanation
Non-repudiation provides assurance that a party cannot credibly deny having performed an action because reliable evidence—such as digital signatures, cryptographic proof, or strong authentication and authorization logs—binds the actor to the event. In a disputed wire approval, those mechanisms support accountability. Availability and confidentiality address different CIA goals; gap analysis identifies control shortfalls but is not itself the evidence property that prevents repudiation.