"authentication" - key terms from Wikipedia

access authentication
active authentication
authentication
authentication and authorization
authentication data
authentication factor
authentication factors
authentication frame
authentication header
authentication info
authentication is intended
authentication mechanism
authentication methods
authentication methods supported
authentication protocol
authentication realm
authentication server
authentication service
basic access authentication
biometric authentication
challenge handshake authentication protocol
digest access authentication
digest authentication
extensible authentication protocol
factor authentication
finger vein authentication
http digest authentication
identification and authentication
initiative for open authentication
integrated windows authentication
message authentication
message authentication code
mutual authentication
nfs authentication
ntlm authentication
open system authentication
openid authentication
otp authentication system
palm vein authentication
radius authentication
remote authentication
rsa authentication manager
server authentication
shared key authentication
simple authentication and security layer
strong authentication
telnet authentication
unified authentication
user authentication
vein authentication technology