c# - ASP.NET authentication using unique numbers -

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i not know called. thought called 2-factor authentication references on web refer email or pin emailed reset password.

i'd have asp.net mvc site require username/password and unique ever-changing number such 1 iphone's authenticator app. little keychanges used have numbers changing?

i have not settled on authentication method yet: azure active directory or custom. have @ 10 users of system, each different "roles": admin, manager (rw) , user (r). if have opinion here, please main question first paragraph.

any / pointers appreciated.

thanks, -ed


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