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Google Authenticator for Android is the open-source two-factor authentication app that generates time-based (TOTP) and counter-based (HOTP) one-time codes entirely on the device. It’s designed to be simple, offline, and standards-compliant, so any service that supports OATH OTP can interoperate with it. The app streamlines enrollment via QR codes or manual key entry, then displays rotating numeric codes with clear account labels to reduce mistakes during login. Because secrets are stored...

... to password reuse and phishing. The app flow revolves around enrolling secrets via QR codes or manual entry, storing them securely on-device, and rendering rotating codes synchronized by time. Because it uses open standards, it interoperates with virtually any service that supports TOTP/HOTP, not just Google properties. The project also serves as a reference for implementers who want to understand enrollment UX, secret provisioning, and code generation at the application layer.