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Authentication

Authentication (from greek: αὐθεντικός; real or genuine, from αὐθέντης authentes; author) is 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.