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Two-Factor Authentication (also abbreviated as 2FA) is a form of authentication where it authenticates combining the one factor authentication with another factor regardless of software or hardware. In this type of authentication, there will be a requirement where you need to present what you have that the server know before being authenticated. There are many 2FA products in the market now and also many types of 2FA products. A few of the popular one are PKI USB Token, OTP Token and also Smart Card. These hardware will provide another piece of information that is required to succeed the authentication.
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