File Encryption in Python

This is a Python project that demonstrates file encryption and decryption using two different encryption methods:

1. Fernet Encryption: A symmetric encryption technique (same key for encryption and decryption).
2. AES + RSA Hybrid Encryption: A more advanced method combining RSA (asymmetric encryption) for encrypting the AES key and AES (symmetric encryption) for encrypting the file contents.

Table of Contents

• Introduction
• Installation
• Usage
  • Fernet Encryption
  • AES + RSA Hybrid Encryption
• How It Works
  • Fernet Encryption
  • AES + RSA Hybrid Encryption
• License

Introduction

This repository contains Python scripts for encrypting and decrypting files using two distinct encryption methods:

1. Fernet Encryption: This is a symmetric encryption technique where the same key is used for both encryption and decryption.
2. AES + RSA Hybrid Encryption: This method uses asymmetric RSA encryption for encrypting the AES key and symmetric AES encryption for encrypting the file's data. It provides better security by combining both encryption techniques.

Installation

To run the encryption scripts, you'll need Python installed along with the following libraries:

• cryptography (for Fernet encryption)
• pycryptodome (for AES and RSA encryption)

You can install them using pip:

pip install cryptography pycryptodome

Usage

Fernet Encryption

The simple_encryption.py script demonstrates how to encrypt and decrypt files using Fernet symmetric encryption.

1. Generate the Encryption Key: The script generates an encryption key and stores it in a file (filekey.key).
2. Encrypt a File: It reads an input file (e.g., test.txt), encrypts it using the key, and writes the encrypted data to a new file (encryptedfile).
3. Decrypt the File: The script demonstrates how to decrypt the encrypted file and save the decrypted content into a new file (decryptedfile).

AES + RSA Hybrid Encryption

The better_encryption.py script demonstrates a more advanced AES + RSA Hybrid Encryption technique. In this method:

• RSA encryption is used to encrypt the AES key (a symmetric key).
• AES encryption is used to encrypt the actual file data.

This method is more secure as it combines both asymmetric and symmetric encryption.

1. Encrypt a File: The script generates a random AES key, encrypts it using RSA, then uses AES to encrypt the file contents.
2. Decrypt a File: The script decrypts the AES key using RSA, then decrypts the file contents using AES.

File Names and Extensions

• test.txt: The file you want to encrypt.
• encryptedfile: The file containing the encrypted content.
• decrypted_test.txt: The file containing the decrypted content.
• rsakey.txt: The file containing the RSA private/public key used for encryption/decryption.

How It Works

Fernet Encryption

1. Generate a Key: The script generates a key that is saved to a file (filekey.key).
2. Encrypt and Decrypt Files: It encrypts a file using the key, and decrypts it using the same key.

AES + RSA Hybrid Encryption

1. Generate AES Key: A random 256-bit AES key is generated to encrypt the file data.
2. Encrypt the AES Key: The AES key is encrypted using RSA encryption.
3. Encrypt the File: The file data is encrypted using AES (with the encrypted AES key).
4. Decrypt the File: The AES key is decrypted using RSA, and then the file data is decrypted using AES.

License

This project is licensed under the MIT License.

What's New:

• I've added sections for the AES + RSA Hybrid Encryption (i.e., better_encryption.py).
• The "Usage" section now describes both the Fernet encryption and AES + RSA encryption methods.
• Detailed code explanations and usage instructions are provided for both scripts.