Fast File Encryption is a lightweight, robust, and developer-friendly solution for encrypting large files—ranging from a few megabytes to several terabytes—securely and efficiently.
Ideal for environments that require:
- Minimal runtime dependencies
- Strong asymmetric encryption using RSA
- High performance for both small and large files
- Requires only Python ≥ 3.11 and the
cryptographypackage - Securely encrypts and decrypts files using RSA public/private key pairs
- Only the public key is needed on the server—no private key exposure
- Supports streaming and large file encryption (up to 10 TB and beyond)
New to the project? Start with our step-by-step Getting Started Guide. It walks you through installation, key generation, and your first file encryption.
Explore the full documentation:
- In-depth reference for encryption and decryption classes
- Key management tools and utilities
- Technical details of the file format
- Python ≥ 3.11
- cryptography package (based on OpenSSL)
Install the dependencies from requirements.txt and execute pytest from
the project root:
pip install -r requirements.txt pytest
Fast File Encryption is built with the following principles:
- Archive Data — Designed to securely archive files.
- Secure by Default — No configurable options that weaken encryption.
- Large File Support — Optimized for files up to several terabytes.
- Metadata Block — Clean separation of encrypted metadata.
- No Key = No Access — Data remains safe even if a server is compromised.
- Corruption Detection — Built-in checksums detect silent corruption.
Have feedback or ideas? Found a bug? We'd love to hear from you.
Copyright © 2021–2025 Tobias Erbsland – https://erbsland.dev/ EducateIT GmbH – https://educateit.ch/
Licensed under the Apache License, Version 2.0.
You may obtain a copy of the license at:
http://www.apache.org/licenses/LICENSE-2.0
Distributed on an “AS IS” basis, without warranties or conditions of any kind. See the LICENSE file for details.
