RSA SecurID One of the most recognized authentication products, RSA's SecurID is a two-factor authentication system
The product is engineered to assure user identities and protect against unauthorized access to applications and resources across numerous physical locations. RSA SecurID technology is comprised of both a broad range of hardware and software authenticators, which provides end users with a one-time password designed to change every 60 seconds. Its software engine -- RSA Authentication Manager -- also scales to support millions of users and provides the benefit of technical certification with more than 300 products.
For more Information: http://www.emc.com/security/rsa-securid.htm