LDAP authentication question

Hello,
I have a Linux box with RHEL4 running on it. The box is meant to be on the DMZ. There is a directory on the box that will be remotely from time to time and I want a form of authentication on it.
Presently, I have configured Basic authentication with apache but the security is not tight.
I read about openldap and I need to know how I can use openldap with my box to authenticate remote users when about to view my box.
Can anyone please help me with this?

no crossposts! plz read the rules. thread closed!