A privacy-focused desktop cloud note application using AES-256-GCM + X25519 elliptic curve encryption for true end-to-end encryption. The server only stores encrypted data and cannot decrypt user note content.

✨ Core Features

Feature	Description
✓ End-to-End Encryption	Notes are encrypted locally before upload; the server never sees plaintext
✓ Hybrid Encryption	X25519 key exchange + AES-256-GCM symmetric encryption
✓ Flexible Key Management	Global key / per-file key / password protection modes
✓ Two-Factor Protection	Combine password + separate key file to protect sensitive notes
✓ Zero-Knowledge Architecture	The server stores no decryption keys
✓ Cross-Platform	Windows / Linux / macOS

🔐 Encryption Algorithms

Key Exchange: X25519 (Elliptic Curve Diffie-Hellman)
Symmetric Encryption: AES-256-GCM (Authenticated Encryption)
Asymmetric Encryption: RSA-2048 (optional)
Key Derivation: PBKDF2 (100,000 iterations)

🛠️ Tech Stack

Language: Python 3.8+
GUI Framework: PyQt5
Encryption Library: cryptography
HTTP Client: requests

🛡️ Security Principles

Trust Not Needed — The server is untrusted by default
Keys Belong to User — All keys exist only on the client
Encrypt Locally — Plaintext never leaves the user's device
Open Source Verifiable — Fully open source, open to security audit

📄 License

This project is licensed under the Apache License 2.0.

👤 Author

dvsxt

🔗 Repository

https://gitcode.com/dvsxt/cloudnote

🎵 For Music Lovers

Want to listen to some music while taking notes? Try my other project —

🔊 ap_ds · The Lightweight Python Audio Revolution

2.5MB ends the era of FFmpeg's 160MB bloat

🎵 Supports MP3 / FLAC / OGG / WAV
⚡ Non-blocking playback, perfect for GUI apps
📦 Zero dependencies, pure Python
🔒 v3.0 LTS long-term support, free forever

pip install ap_ds

from ap_ds import AudioLibrary
lib = AudioLibrary()
lib.play_from_file("inspiration.mp3")  # listen while taking notes

👉 Learn more about ap_ds

From the same author, with the same values: lightweight, secure, pure.