a multi factor authentication requires at least two sets of credentials. This is typically something you know (e. g. a password) and something you own (e. g. a token generator or mobile phone)

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Generating backup codes for a 2FA implementation

I have implemented the login/verification aspect of a two factor auth system as per RFC 6238. It works fine with Google Authenticator, which is great. Now I am turning my attention to the backup ...