---
title: "Discussion on \"Under the Hood: How 2FA TOTP Authenticator Apps Work\" | Hashnode"
description: "Discussion on \"Under the Hood: How 2FA TOTP Authenticator Apps Work\". And a walkthrough of how TwoFac Generates Your 2FA Codes"
url: "https://hashnode.com/posts/under-the-hood-how-totp-works-and-how-twofac-generates-your-2fa-codes/69adb1a486766ac3a64750ae"
---

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Discussion

# [Under the Hood: How 2FA TOTP Authenticator Apps Work](https://arnav.tech/under-the-hood-how-totp-works-and-how-twofac-generates-your-2fa-codes?utm_source=hashnode&utm_medium=feed)

And a walkthrough of how TwoFac Generates Your 2FA Codes

Mar 8 · 18 min read · arnav.tech  
Read the article

-   [#kotlin](https://hashnode.com/tag/kotlin)
-   [#cryptography](https://hashnode.com/tag/cryptography)
-   [#otp](https://hashnode.com/tag/otp)
-   [#security](https://hashnode.com/tag/security)
-   [#two-factor-authentication](https://hashnode.com/tag/two-factor-authentication)
-   [#2fa](https://hashnode.com/tag/2fa)

## Written by

[Arnav Gupta](https://hashnode.com/@arnavgupta)

@arnavgupta

  
[View profile](https://hashnode.com/@arnavgupta)

Android and NodeJS Developer and Teacher. Have founded a few companies.

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