authentication
Concise Oxford English Dictionary © 2008 Oxford University Press:
authenticate/ɔːˈθentɪkeɪt/
▶verb prove or show to be authentic.
– derivatives
authentication /-ˈkeɪʃ(ə)n/ noun,
authenticator noun.
authentication /-ˈkeɪʃ(ə)n/ noun,
authenticator noun.
'authentication' also found in these Oxford entries:

