Google Authenticator

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wikipedia:Google Authenticator (2010) is a software-based authenticator by Google that implements two-step verification services using the Time-based One-time Password Algorithm (TOTP; specified in RFC 6238) and HMAC-based One-time Password algorithm (HOTP; specified in RFC 4226), for authenticating users of software applications.[1]

Google Authenticator was open-source until 2013[2]

The Android OS allows apps to protect their users by blocking other apps from screenshotting their content. This is done by adding a "FLAG_SECURE" option inside the app's configuration.

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  1. "GitHub - google/google-authenticator: Open source version of Google Authenticator (except the Android app)". GitHub. These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. https://lwn.net/Articles/581086/

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