Google Authenticator

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.

Google Authenticator was open-source until 2013

• https://github.com/google/google-authenticator/issues/401 screenshot

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.

Related terms

• Authy (Twilio) (TOTP)
• Duo
• Ubuntu: apt-get install libpam-google-authenticator
• FreeOTP
• Hashcat
• brew install google-authenticator-libpam
• Google prompts
• Microsoft Authenticator
• FIDO2
• ThreatFabric

See also

• YubiKey, Yubico, FIDO security keys, FIDO2, WebAuthn, 5C Nano, YubiKey Manager, ykman
• Google Authenticator, libpam-google-authenticator, google-authenticator-libpam (macOS), google-authenticator
• MFA: FreeOTP, Google Authenticator, Okta Verify, Duo Security, Microsoft Authenticator, Strong customer authentication, Dualshield, HOTP, TOTP, OATH, Authy, Push authentication, google-authenticator, Duo Mobile, DenyAllExceptListedIfNoMFA, Configure MFA on AWS, LastPass Authenticator mobile app
• Authentication, AAA, MFA, OpenID, OAuth, OATH, PAM, Personal access token, CWE: Broken Access Control, PAT, Mutual authentication, Federated authentication, IdP, Amazon Cognito, Phone to sign in, Firebase Authentication, Auth0, WebAuthn, Web3auth, Challenge-response, Passwordless authentication, HMAC, HOTP, TOTP, OATH

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