Mini Diarium: Secure, Local Journaling App Reborn with Rust, SolidJS, and Tauri

For those seeking a digital sanctuary for their thoughts, Mini Diarium presents a compelling option. This new journaling app, inspired by the now-defunct Mini Diary, prioritizes privacy and security by encrypting every entry with AES-256-GCM before it's stored locally. Unlike many contemporary applications, Mini Diarium maintains a strict offline policy, guaranteeing your data never leaves your device.

The project's creator, Francisco J. Revoredo, reimagined the original Mini Diary using a modern tech stack consisting of Tauri 2, SolidJS, and Rust. This complete rebuild results in a faster, more lightweight application with enhanced encryption capabilities and a few user-friendly additions. Mini Diarium employs a wrapped master key design to enhance security, ensuring the master key is never stored in plaintext.

One of Mini Diarium's standout features is its flexible authentication system. While most journaling apps offer only password protection, Mini Diarium allows users to unlock their journals using either a password or an X25519 private key file, similar to an SSH key. Users can choose the method that best suits their needs or even register both for added convenience. Each authentication method encrypts its own copy of a randomly generated master key, which in turn encrypts all diary entries. The use of X25519 ECIES for key file wrapping further strengthens security.

Given its local-first approach, backup of your key file is critical. Similar to an SSH private key, your key file cannot be regenerated. If both your password and key files are lost, there is no recovery path to access your data. Always remember to back up the keyfile.

Mini Diarium is available for Windows, macOS, and Linux. While Windows users may encounter a SmartScreen warning on first launch, this is expected for unsigned applications. The app is open-source and builds are reproducible from source, providing an extra layer of assurance. macOS users may need to right-click the app icon and select "Open" to bypass Gatekeeper on the initial launch.

Developers interested in contributing to Mini Diarium can find setup instructions, development workflow guidelines, and coding conventions in the CONTRIBUTING.md file. Maintainers can refer to the RELEASING.md document for step-by-step release instructions. Security-conscious users are encouraged to review the SECURITY.md file for information on the app's security model and vulnerability reporting procedures.

With its emphasis on privacy, security, and local storage, Mini Diarium presents a refreshing alternative to cloud-based journaling applications. Its modern tech stack and flexible authentication options make it an appealing choice for users seeking a secure and personal space for their thoughts and reflections.