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Two-factor authentication
Two-factor authentication (TFA, T-FA or 2FA) is an approach to authentication which requires the presentation of "two or more" of the three authentication "factors" ("something the user knows", "something the user has", and "something the user is").
More at Wikipedia
Authentication
Identity management
More related topics
Mobile signature
Mutual authentication
One-time password
Security token
Authentication methods
Computer access control
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