public EncryptionMethod getProxyEncryptionMethod() {
        return proxyEncryptionMethod;
    }
Returns the type of encryption required by the desired guacd instance.
If the encryption method of the default guacd instance should be used
instead, null is returned.

@return
    The type of encryption required by the desired guacd instance, or
    null if the encryption method of the default guacd instance should
    be used.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/connection/ConnectionModel.java