A possession factor is an authentication method based on something the user physically possesses. A hardware authentication token is a small physical device that can generate a secure login code or house digital certificates and is carried by the user to provide a possession factor for authentication. Eye color is a trait, not something possessed. A password is something the user knows, and a mobile app authorization request, while delivered to a device the user possesses, by itself is not considered a possession factor until accepted and is not inherently a physical item.
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What exactly is a hardware authentication token?
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What are the other factors in multi-factor authentication?
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How does a mobile app authorization request fit into multi-factor authentication?