Two-factor Authentication - Examples

Examples

Several popular web services employ two-factor authentication, usually as an optional feature that is deactivated by default.

Some Web services using two-factor authentication
Web service TFA name
Amazon Web Services AWS Multi-Factor Authentication
Dropbox Two-Factor Verification
Facebook Login approvals
Google Accounts 2-step verification/Google Authenticator
Microsoft/Hotmail Microsoft account Security Code
Paypal/eBay Security Key

Read more about this topic:  Two-factor Authentication

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