I haven't used it, but first result in google is this for OpenLDAP: http://www.phoronix.com/scan.php?page=news_item&px=openldap-totp-support http://www.phoronix

I haven't used it, but first result in google is this for OpenLDAP: http://www.phoronix.com/scan.php?page=news_item&px=openldap-totp-support http://www.phoronix.com/scan.php?page=news_item&px=openldap-... . What I really meant was that you have user who types password, an app that uses LDAP protocol to send password and LDAP server which verfies it. You can easily password generator (as many banks do) without changing LDAP protocol.