What is dual-factor authenticator setup in MVC?
PICTURE THIS: HASH MAP
Simple meaning
User enables TOTP, scans a QR code, and we store the key protected.
WHY — Identity instead of guessing?
Why interviewers care about Identity:
who only read docs from people who shipped.
and tied to .NET MVC work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1User enables TOTP, scans
a QR code, and we store the key protected.
- 2Why it exists
Login challenges for the code.
- 3Recovery codes are generated
once and stored hashed.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
User enables TOTP, scans a QR code, and we store the key protected. Login challenges for the code.