freeOTP is a soft token authenticator that can be used for two-factor authentication, and is available as a free Android app or iOS app. Two-factor authentication — requiring a user to have “something you have”, as well as “something you know” i.e. a password – is being supported on many more services these days. Popular ways to implement the second factor include a hardware token, a YubiKey, or a soft token application that is on your mobile phone (as freeOTP does).
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