– single sign-on with Kerberos KDC built-in to OS X Server (kerberos)
– a password stored securely in the Open Directory Password server database ( OD Password server)
– a password stored as several hashes– including NT LAN Manager (NTLM), NTLMv2, and LAN Manager — in a file that only the root user can access (known as shadow password )– this is only for users stored in local directory (shared directory cannot use shadow password)
– a crypt password stored directly in users account (for backward compatibility with legacy systems)
– a non-Apple LDAP server for LDAP bind authentication