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Authentication is the process of determining whether someone or something is, in fact, who or what it is declared to be.

Authentication is the process of determining whether someone or something is, in fact, who or what it is declared to be - the act of confirming the truth of an attribute of a datum or entity. This might involve confirming the identity of a person or software program, tracing the origins of an artifact, or ensuring that a product is what its packaging and labeling claims to be. Authentication often involves verifying the validity of at least one form of identification.

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