rysasahrialThe Secure 2FA Android App – Open‑Source TOTP Authenticator delivers a privacy‑focused two‑factor authentication solution for Android and Wear OS users. This powerful open‑source source code supports both TOTP (time‑based) and HOTP (counter‑based) algorithms with SHA‑1, SHA‑256, and SHA‑512 hashing, as well as compatibility with mOTP, Steam, and Yandex authentication codes. Developers interested in source code customization will appreciate features like encrypted backups, intuitive icon categories, Dark Mode, a Wear OS companion, and seamless import from major authenticator apps through well‑documented backup file formats.
The app’s backup and restore functionality leverages the GPL‑3.0 licensed source code to provide secure, encrypted backups that developers can integrate into their custom builds. This makes migration easy—especially for those transitioning from Google Authenticator, Blizzard, Steam, or Authy. Its brand icon support, category organization, and flexible UI customizations enhance code readability and usability. For example, strong encryption in backup source code ensures that sensitive TOTP secrets remain secure both in transit and storage.
Because the project is fully open‑source, the codebase is auditable and free from vendor lock‑in. Source code contributors can enhance localization, add new hashing routines, or tweak scanning logic—like the vigilant QR‑code scanning improvements introduced in the latest v1.2.5 release. Developers can also sync the Wear OS companion through fully documented inter‑app communication protocols.
With minimal permissions and offline functionality, this TOTP authenticator app reduces attack surfaces and meets strict data‑privacy requirements. Whether you are building custom 2FA integrations or just looking for a secure, customizable authenticator, the source code delivers reliable performance, robust encryption, and a developer‑friendly architecture—all backed by a GPL‑3.0 license. Its focus on open‑source authentication code, source code scanning, and encryption libraries ties together both security and user experience.
- Author: Jamie‑mh (stratumauth)
- Programming Language: C# (Xamarin.Android & Xamarin.WearOS), with HTML + Python in supporting documentation
- License: GPL‑3.0
- Licence / Usage Limitations: The source code is free to use, modify, and distribute under GPL‑3.0 terms. Redistribution and derivative works must also be licensed under GPL‑3.0. There is no warranty; usage is at your own risk.