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Krypton

Two-factor authentication app using your phone

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Krypton is a mobile app that provides two-factor authentication for web logins using the FIDO U2F and WebAuthn standards. It replaces one-time codes from SMS or authenticator apps, which can be phished, with keys stored on the phone; the company states it cannot access them.

The app pairs with a computer so sign-in can happen without touching the phone, with an optional one-tap sign-in mode. Setup is done by scanning once. Keys are held in the iOS Secure Enclave or Android Keystore, and the architecture is described as end-to-end verified and encrypted, with zero trust. The source is published on GitHub.

Krypton is aimed at people who want two-factor protection for web accounts without typing codes. It is available as a mobile app for iOS and Android; the pages do not state a free plan, trial, editions, or seat-based or usage-based packaging.

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