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## Description and algorithm
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https://en.wikipedia.org/wiki/Time-based_One-Time_Password
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## Client implementations
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- https://github.com/Authenticator-Extension/Authenticator (Chrome, Firefox, Edge)
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- https://play.google.com/store/apps/details?id=org.fedorahosted.freeotp (android)
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- https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2 (android)
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- https://www.nongnu.org/oath-toolkit/man-oathtool.html
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## Recovery/emergency codes
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Get and store in a secure way
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