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Under the Hood: How 2FA TOTP Authenticator Apps Work

arnav.tech · published 8 March 2026

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https://arnav.tech/architecting-twofac-my-journey-into-kotlin-multiplatform-module-structure
arnav.tech
https://datatracker.ietf.org/doc/html/rfc4226
datatracker.ietf.org
https://datatracker.ietf.org/doc/html/rfc2104
datatracker.ietf.org
https://datatracker.ietf.org/doc/html/rfc6238
datatracker.ietf.org
https://github.com/google/google-authenticator/wiki/Key-Uri-Format
github.com
https://datatracker.ietf.org/doc/draft-linuxgemini-otpauth-uri/
datatracker.ietf.org
https://datatracker.ietf.org/doc/html/rfc4648
datatracker.ietf.org
https://www.androidauthority.com/google-authenticator-e2e-encryption-3317498/
androidauthority.com
Google Authenticator now supports Google Account synchronization Read at the source ↗
security.googleblog.com
https://developer.apple.com/documentation/security/keychain-services
developer.apple.com
https://developer.android.com/reference/androidx/security/crypto/EncryptedSharedPreferences
developer.android.com
https://datatracker.ietf.org/doc/html/rfc2898
datatracker.ietf.org
https://www.twilio.com/docs/authy
twilio.com
https://techcrunch.com/2024/07/03/twilio-says-hackers-identified-cell-phone-numbers-of-two-factor-app-authy-users/
techcrunch.com
https://csrc.nist.gov/publications/detail/sp/800-38d/final
csrc.nist.gov
https://www.rfc-editor.org/rfc/rfc9106.html
rfc-editor.org
https://bitwarden.com/help/is-bitwarden-audited/
bitwarden.com
https://2fas.com/
2fas.com
https://github.com/twofas
github.com
https://ente.io/auth/
ente.io
https://doc.libsodium.org/secret-key_cryptography/aead/chacha20-poly1305/xchacha20-poly1305_construction
doc.libsodium.org
https://github.com/ente-io/ente
github.com
https://github.com/whyoleg/cryptography-kotlin
github.com
https://github.com/whyoleg
github.com
https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API
developer.mozilla.org
https://github.com/championswimmer/TwoFac/tree/main/sharedLib/src/commonTest/kotlin/tech/arnav/twofac/lib/otp/HOTPTest.kt
github.com
https://github.com/championswimmer/TwoFac/tree/main/sharedLib/src/commonTest/kotlin/tech/arnav/twofac/lib/otp/TOTPTest.kt
github.com
https://github.com/championswimmer/TwoFac
github.com