La autenticación es el acto o proceso para el establecimiento o confirmación de algo (o alguien) como real. La autenticación de un objeto puede significar (pensar) la confirmación de su procedencia, mientras que la autenticación de una persona a menudo consiste en verificar su identidad. Todo ello en función de uno o varios factores.

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Authentication (from Greek: αὐθεντικός authentikos, "real, genuine", from αὐθέντης authentes, "author") is the act of confirming the truth of an attribute of a single piece of data (a datum) claimed true by an entity. In contrast with identification which refers to the act of stating or otherwise indicating a claim purportedly attesting to a person or thing's identity, authentication is the process of actually confirming that identity. It might involve confirming the identity of a person by validating their identity documents, verifying the authenticity of a website with a digital certificate, determining the age of an artifact by carbon dating, or ensuring that a product is what its packaging and labeling claim to be. In other words, authentication often involves verifying the validity of at least one form of identification.

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