andOTP - Android OTP Authenticator

andOTP is a two-factor authentication App for Android 4.4+.

It implements Time-based One-time Passwords (TOTP) like specified in RFC 6238.
Simply scan the QR code and login with the generated 6-digit code.

This is a fork of the great OTP Authenticator app written by Bruno Bierbaumer, which has sadly been inactive since 2015. All credit for the original version goes to Bruno.

Features:

Free and Open-Source
Requires minimal permissions
- Camera access for QR code scanning
- Storage access for import and export of the database
Encrypted storage
Plain-text backups
Encrypted backups using OpenPGP
Sleek minimalistic Material Design
Great Usability
Compatible with Google Authenticator

Backups:

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.

TODO:

HOTP Support

Downloads:

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!

Discussion:

If you want to discuss this app, share ideas for features or get help with bugs please head over to the XDA thread.

Acknowledgments:

Open-source components used:

Code examples used:

License:

Copyright (C) 2017 Jakob Nixdorf <flocke@shadowice.org>
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.

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