at can be proven to be genuine. Authenticity is conferred on a record by its mode, form, and/or state of
 transmission, and/or manner of preservation and custody. [Archives] 
n., An authentic record is one that can be proven: To be what it purports to be; to have been created or sent by the person
purported to have created or sent it; to have been created or sent at the time purported. [General Dictionaries] 
v., To establish an individual's identity in order to grant access to a system or resources to whic