andOTP - Android OTP Authenticator
andOTP is a two-factor authentication App for Android 5.1+.
It implements Time-based One-time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP). Simply scan the QR code and login with the generated 6-digit code.
This project started out as a fork of the great OTP Authenticator app written by Bruno Bierbaumer, which has sadly been inactive since 2015. By now almost every aspect of the app has been changed/re-written so the fork status of the Github repository got detached upon user request. But all credit for the original version and for starting this project still goes to Bruno!
I currently don't have that much time to spend developing andOTP, so any contributions are always welcome. Don't worry, I will still continue to develop andOTP it will just slow down from the incredible speed I had going in the beginning.
- Free and Open-Source
- Requires minimal permissions
- Camera access for QR code scanning
- Storage access for import and export of the database
- Encrypted storage with two backends:
- Android KeyStore
- Password / PIN
- Multiple backup options:
- Sleek minimalistic Material Design with three different themes:
- Black (for OLED screens)
- Great Usability
- Compatible with Google Authenticator
- Supported algorithms:
To keep your account information as secure as possible andOTP only stores it in encrypted data files. A part of the encryption key used for that is stored in the Android KeyStore system. The advantage of this approach is that the key is kept separate from the apps data and, as a bonus, can be backed by hardware cryptography (if your device supports this).
However, due to that separation, backups with 3rd-party apps like Titanium Backup can not be used with andOTP. Such apps only backup the encrypted data files and not the encryption key, which renders them useless.
Please only use the internal backup functions provided by andOTP to backup your accounts! Everything else WILL result in data loss.
Opening the backups on your PC:
- OpenPGP: OpenPGP can be used to easily decrypt the OpenPGP-encrypted backups on your PC.
- andOTP-decrypt: Python script written by @asmw to decrypt the old and new password-protected backup format on your PC.
- mac2fa: Electron app for macOS that lives in your system tray and generates OTPs from an encrypted backup file.
- go-andotp: CLI Program written in go to encrypt/decrypt andOTP files on your PC. Decrypted files can be encrypted and imported back to andOTP.
- BroadcastReceivers: AndOTP supports a number of broadcasts to perform automated backups, eg. via Tasker. These will get saved to the defined backup directory. These only work when KeyStore is used as the encryption mechanism
- org.shadowice.flocke.andotp.broadcast.PLAIN_TEXT_BACKUP: Perform a plain text backup. WARNING: This will save your 2FA tokens onto the disk in an unencrypted manner!
- org.shadowice.flocke.andotp.broadcast.ENCRYPTED_BACKUP: Perform an encrypted backup of your 2FA database using the selected password in settings.
Check out this wiki page to learn about the different ways to migrate to andOTP from other 2FA apps.
Warning: All three versions (Google Play, F-Droid and the APKs) are not compatible (not signed by the same key)! You will have to uninstall one to install the other, which will delete all your data. So make sure you have a current backup before switching!
- Translation: If you want to help translate andOTP into your language head over to the Crowdin project.
- Bug reports and feature requests: You can report bugs and request features in the Issue tracker on GitHub.
- Requesting thumbnails: If you are missing a thumbnail you can request it by opening a thumbnail request.
- Discussion and support:
If you want to show your appreciation for our work with a small donation you can do so using the following links:
Open-source components used:
- Apache Commons Codec
- Expandable Layout
- Floating Action Button Speed Dial
- OpenPGP API library
- ZXing Android Embedded
- Droid Sans Mono Zeromod
Code examples used:
- Code Parts from Google's Android Samples
Previously used open-source components:
Previously used code examples:
Copyright (C) 2017-2020 Jakob Nixdorf <[email protected]> Copyright (C) 2015 Bruno Bierbaumer Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.