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An Authentication Type specifies which credentials the user
is required to supply in order to be authenticated and where the
user's authentication data are stored. It is defined by the value
of Auth-Type attribute in LHS of a `users' entry.
7.1 Accept Authentication Type Accept unconditionally. 7.2 Reject Authentication Type Reject unconditionally. 7.3 Local Password Authentication Type Authenticate using plaintext password. 7.4 Encrypted Password Authentication Type Authenticate using MD5 encrypted password. 7.5 System Authentication Type Authenticate using system account. 7.6 SQL Authentication Type Authenticate using SQL. 7.7 PAM Authentication Type Authenticate using PAM. 7.8 Defining Custom Authentication Types 7.9 Multiple Login Checking Checking for Simultaneous Logins. 7.10 Controlling Authentication Probes