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Andrew Liu edited this page Jun 23, 2018
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The Google Authenticator project includes implementations of one-time passcode generators for Android. One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH) (which is unrelated to OAuth).
This implementation 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.
The Android mobile app supports:
- Multiple accounts
- Support for 30-second TOTP codes
- Support for counter-based HOTP codes
- Key provisioning via scanning a QR code
- Manual key entry of RFC 3548 base32 key strings
DISCLAIMER: This open source project allows you to download the code that powered version 2.21 of the application. Subsequent versions contain Google-specific workflows that are not part of the project.