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  4. two-factor authentication

Glossary

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two-factor authentication

A type of authentication that is based on something a user knows (factor one) plus something the user has (factor two). In order to access a network, the user must have both factors (in the same way that a user must have an ATM card and a personal identification number [PIN] to retrieve money from a bank account). In order to be authenticated during the challenge/response process, the user must have this specific (private) information.