Authentication: Something One Has

Companies are developing various authentication methods, including third-party services for authentication.

One such 3rd-party authentication method is physical tokens, which are tangible items, such as cards or devices that contains security information about a user and can be verified by the company's system.

An example of a physical token is RSA SecureID. We'll explain how it works next.

An RSA SecureID token.

An RSA SecureID token. Taken from rsa.com.