RSA SecurID® two-factor authentication is based on something you know (a password or PIN) and something you have (an authenticator)—providing a much more reliable level of user authentication than reusable passwords. RSA offers enterprises a wide range of user authentication options to help positively identify users before they interact with mission-critical data and applications.
Using RSA SecurID Tokens for Authentication On-line Tour
Are passwords really free? A Closer Look at the Hidden Costs of Password Security (PDF White Paper)
RSA Secured Partner Solution Directory for RSA SecurID