🔐 Flutter Password Manager

A secure and minimal open-source password manager built with Flutter.
It uses AES encryption and local Hive storage to protect user data, with optional backup and restore functionality via Google Drive (SAF).

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📲 Features

• 🔐 Secure Local Storage: AES-256 encryption with unique keys
• 🔑 Master Password: Required to unlock stored credentials
• ☁️ Cloud Sync: Backup and restore data to Google Drive
• 🧠 Minimalist UI: Intuitive, clutter-free design
• 🔍 Search Functionality: Quickly find saved credentials
• 🛡️ Secure Storage: Uses flutter_secure_storage for storing sensitive values

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🛠️ Tech Stack

Layer	Package / Tool
UI	Flutter (Material Design)
Local Storage	Hive (NoSQL)
Encryption	encrypt, flutter_secure_storage
Cloud Sync	Google Sign-In, Storage Access Framework (SAF)
State Mgmt	SetState (basic)

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📂 Folder Structure

lib/
├── main.dart               # App entry point
├── models/                 # Data models (e.g., Credential)
├── screens/                # UI screens (home, login, add/edit)
├── services/               # Business logic: encryption, auth, storage
└── widgets/                # Reusable UI components

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🚀 Getting Started

📋 Prerequisites

• Flutter 3.19 or higher
• Dart SDK
• Android Studio or VS Code
• Android device or emulator (API 23+)

🧑‍💻 Installation

git clone https://github.com/KavyaJP/Password-Manager.git
cd Password-Manager
flutter pub get
flutter run

Note: You will have to give your own SHA-1 Key to OAuth Client of google if you want google sign in features to work

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🔐 Security Implementation

• AES-256 encryption for password data
• Master password stored securely using flutter_secure_storage
• Backups are encrypted and uploaded only after user confirmation
• Files are handled via Android's Storage Access Framework (SAF)

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📱 Android Target

• Min SDK: 23 (Android 6.0)
• Target SDK: 35 (Android 15)
• Compile SDK: 35

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🧪 Testing

• Manual testing on Android emulators and physical devices
• Master password verification and backup integrity tested
• File encryption and decryption verified against tampering

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🔧 Features Yet to Be Implemented

Here are some suggested features that can improve the app further. They are divided into practical, security-focused, and UX-related categories.

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• Windows Support
• Linux Support

✅ Practical Features

• Search & Filter Vault

  • Search by service, username, or note.
  • Filter favorites or entries with images only.

• Category/Folder Support

  • Organize entries under tags or folders like “Finance,” “Social,” “Crypto,” etc.

• Password Generator

  • Built-in secure password generator with configurable rules (length, symbols, etc.).

• Auto-fill Integration (Android)

  • Support Android’s autofill framework for direct login to apps and browsers.

• QR Code Support

  • Generate QR codes for credentials.
  • Scan QR codes to import (e.g., crypto wallets, Wi-Fi logins).

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🔐 Security-Focused Features

• Field-Level Encryption

  • Encrypt sensitive fields like password and notes separately.

• Encrypted Export Format

  • Allow exporting vault as .vault file encrypted with a passphrase.

• Security Logs

  • Track vault access times, modification history, and restore logs.

• Biometric Authentication

  • Uses Android's builtin api to authenticate user

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🌟 UX & UI Improvements

• Dark Mode Toggle

  • Manual toggle in-app (if not already following system).

• Cloud Sync to User’s Own Google Drive Folder

  • Let users store backups in visible Drive folders instead of appDataFolder.

• In-app Onboarding / Walkthrough

  • A short guide for new users explaining features like adding entries, backup, etc.

• Backup Reminder

  • Show periodic reminders to backup vault (banner or notification).

• Undo Delete

  • Provide undo option for a few seconds after deleting an entry.

• Biometric Timeout

  • Auto-lock the vault after X minutes of inactivity, requiring fingerprint again.

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📜 License

MIT License © 2025

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🙌 Contributions

Contributions are welcome! Feel free to fork the repo and submit pull requests.
For bugs or feature suggestions, open an issue.