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two-factor authentication
comp., MS, Braz.	autenticação de dois fatores (An authentication method that requires two authentication methods, which may include something the user provides, such as certificates; something the user knows, such as user names, passwords, or pass phrases; physical attributes, such as a thumbprint; and personal attributes, such as a personal signature)
English thesaurus
two-factor authentication
IT	The use of two independent mechanisms for authentication, e.g., requiring a smart card and a password typically the combination of something you know, are or have
Two- Factor Authentication
sec.sys., abbr.	TFA