RSA SecurId - two factor authentication

Currently working on RSA SecurId Authentication.

RSA SecurId is a popular two factor authentication mechanism.

For successful authentication, not only you need what you KNOW ( say a PASSWORD), but also what you HAVE ( a SecurId device which generates TOKEN every 60s).

The TOKEN is generated by Device and also RSA Server from the TIME and also the SEED ( say a Unique number for that Device Serial Number)