Sony Online Entertainment has released a keyring authenticator for $9.99. The authenticator functions with all SOE titles. According to the released information, a mobile authenticator is scheduled to be 'released soon'. Players can tie the authenticator to their Station Account.
How does the SOE Authenticator work?
You will need to add your SOE Authenticator to your Station Account by linking your account with your SOE Authenticator security device. Once the Station Account is linked, the SOE Authenticator will be required to log in to your account. Please note that once your Station Account is linked with an SOE Authenticator you will be required to supply your password plus the authenticator code (PIN) for all Station Account logins.
Read more about the SOE Authenticator.