CLI File Encryptor

A production-grade, secure File Encryption and Decryption application built in Python. This tool uses cryptography.fernet (AES symmetric encryption) and supports both single-file processing and batch directory processing.

Prerequisites

• Python 3.8+
• Dependencies listed in requirements.txt

Setup Instructions

1. Navigate to the directory:

   cd CLIFileEncryptor

2. Install requirements:

   pip install -r requirements.txt

3. Generate an Encryption Key: Before you can encrypt or decrypt files, you must generate a secure key. This will create a secret.key file in the directory.

   python app.py generate-key

   WARNING: DO NOT lose or share this secret.key file. Anyone with this file can decrypt your data. If you lose it, you cannot recover your encrypted files. It is explicitly ignored in .gitignore.

Usage Guide

You can view the help menu anytime by running:

python app.py --help

1. Encrypting Files

Encrypt a Single File:

python app.py encrypt --file "path/to/your/file.txt"

This will create an encrypted copy named file.txt.enc.

Encrypt a Directory (Batch):

python app.py encrypt --dir "path/to/your/folder"

This recursively processes all files. Files that are already encrypted (ending in .enc) and the secret.key itself will be safely skipped.

2. Decrypting Files

Decrypt a Single File:

python app.py decrypt --file "path/to/your/file.txt.enc"

This will restore the original file by decrypting the content and removing the .enc extension.

Decrypt a Directory (Batch):

python app.py decrypt --dir "path/to/your/folder"

This recursively decrypts all .enc files in the folder.