authentification system

Hello, I'm building an usenet server on top of Leap 15.3. Looks like it would be interesting to authenticate users. Somebody spoke of kerberos. I don't expect more than a hundred users, at most. do you know some system a bit simpler? Do you have some link (including to Kerberos under Leap)? thanks jdd -- http://dodin.org http://valeriedodin.com