Examples
Several popular web services employ two-factor authentication, usually as an optional feature that is deactivated by default.
| Web service | TFA name |
|---|---|
| Amazon Web Services | AWS Multi-Factor Authentication |
| Dropbox | Two-Factor Verification |
| 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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—Bernard Mandeville (1670–1733)
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