# Sources of Authentication Data

The server uses only one source of X.509 certificate authentication data, namely, the server parameter `ssl_server_trusted` (its value is set in EMS an configuration file). The server can use three sources of secure password authentication data:

- Local data from the EMS configuration files.
- External data from an LDAP.
- A user-supplied JAAS LoginModule.

You must safeguard the security of EMS configuration files and LDAP servers.

For more information, see `ssl_server_trusted`.

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