ncrypted

ncrypted is a cross-platform Flutter app for end-to-end encrypted file exchange using QR-based key sharing and .ncry packages.

Features

• Local identity keypair generation and secure key storage.
• Contact exchange via QR code / public key.
• File encryption to .ncry with hybrid crypto:
  • RSA (OAEP/PSS) for key wrapping/signatures
  • AES-256-GCM for file encryption
• Signature verification on decrypt with optional strict mode.
• Advanced security options (RSA key size/exponent) with apply-and-regenerate flow.
• Theme support with optional easter-egg terminal mode at max security profile.

Project Structure

• lib/main.dart - app shell, navigation, theme wiring.
• lib/screens/ - UI flows (My Key, Contacts, Send, Open, Options).
• lib/services/ - crypto, package format, persistence, preferences.
• lib/models/ - data models (EncPackage, Contact).
• test/ + ncry_test.dart - widget + crypto/package tests.

Quick Start

1. Install Flutter SDK.
2. From project root:

flutter pub get
flutter run

Testing and Quality

flutter analyze
flutter test

Release Process

• Use RELEASE_CHECKLIST.md for the full pre-ship and post-ship flow.

Build Notes

• Encrypted files use the .ncry extension.
• Current package format version is 0x0002 (single active version).

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