MEFSC is a C++ based encrypted file server/client system that allows multiple users to securely store and retrieve files over a local or remote network. It's meant to act as your own private cloud, hosted on hardware you own and ideally accessed via Tailscale or other VPN.
- Secure file upload/download via symmetric encryption
- User authentication via SQLite3
- File chunking and encryption with libsodium
- Multi-user access
- Tailscale compatibility for remote, secure connectivity
Encrypted files are stored on the server under per-user directories, and decrypted files are downloaded locally to the client’s working directory.
- Users authenticate with credentials stored in a local SQLite3 database on the server.
- After successful login, the client can:
- Encrypt and upload a file to the server
- Download and decrypt a file from the server
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Server stores files encrypted at rest in:
build/MEF_S/<username>/ -
Client writes decrypted files to its current working directory.
- Uses TCP sockets for reliable, in-order chunk transmission because encrypted chunk shuffling would make decryption impossible.
- Everything is encrypted client-side before transmission, and decrypted after download.
- Uses libsodium for encryption.
- Symmetric encryption is applied per session.
- Files are encrypted/decrypted in chunks for better scalability and memory efficiency.
sudo apt install sqlite3 libsqlite3-dev libsodium-dev cmake build-essential
sudo dnf install sqlite-devel libsodium-devel make cmake
cd build
cmake ..
make
build/server is the server binary.
build/client_fs/client is the client binary.
Execute them and follow the prompts :) it's that straight forward.