Freeradius as a PIN server?

Sorry for the newbie question, but, quite simply, could Freeradius be configured to provide a simple 'PIN Server' ? - I want users to be able to choose a 4 digit PIN, and then have Freeradius validate Logon requests using the username/PIN combination (in addition to some separate LDAP authentication) Really, I am looking to build a lightweight 2-factor authentication system, without the expense of RSA SecurID or similar. Regards, Peter Moreton *************************************************************************************** The CBI's (Confederation of British Industry's) registered address is: Centre Point, 103 New Oxford Street, London WC1A 1DU Company number: RC000139