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                                      Secure Cryptography Toolkit

Purpose

Data security is a critical necessity in today's digital environment. By consolidating fundamental cryptographic operations into a menu-driven or single command-line interface, this toolkit offers a range of capabilities, including secure file processing, message protection, integrity verification, and the storage of sensitive data.

Professional objectives of the toolkit:

• Applied Security: Implements industry-standard algorithms such as AES-GCM and RSA for file and message protection.
• Integrity Assurance: Provides SHA256 hashing and signature verification to ensure data has not been altered.
• Authentication: Uses RSA signing and verification to confirm the authenticity of files and sources.
• Confidentiality: Offers steganography to conceal information within PNG images for an additional security layer.
• Educational Use: Serves as a practical tool for students and researchers to experiment with cryptographic concepts.
• Cross-System Collaboration: Enables encrypted files and messages to be securely shared and decrypted on different systems using provided keys. (new)

This toolkit is designed for both cybersecurity professionals and academic/research environments.

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Features

• AES-GCM file encryption/decryption
• RSA key generation, message encryption/decryption
• RSA file signing and signature verification
• SHA256 hashing and integrity checks
• Strong password generation
• Steganography for hiding/extracting data in PNG images
• ASCII menu interface with quick reply
• Command-line argument support → Run specific operations directly with flags (e.g., --encrypt, --manual, --password) without using the interactive menu.
• Cross-system decryption support (new):
  Encrypted files/messages can be shared with another user,
  who can decrypt them on their own system using the provided keys.

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📦 Installation and usage

You can use the tool interactively via the menu or run it directly from the command line using arguments.

⚠️ Note: Due to modern system restrictions (such as externally-managed environments), you must utilize the virtual environment (venv) to ensure external libraries function correctly.

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İnteractive Menu Mode

git clone https://github.com/aybiketutarr/crypto_toolkit.git
cd crypto_toolkit
python -m venv venv
source venv/bin/activate ("deactivate" to exit)
pip install -r requirements.txt
python crypto.py

Command-Line Arguments Mode

• Method 1: Activating the virtual environment first (Recommended)

  Note: To use this method, you must be in the project's root folder (cd crypto_toolkit) in the terminal.

  cd crypto_toolkit
  source venv/bin/activate ("deactivate" to exit)
  python crypto.py --encrypt ~/file.txt
  

• Method 2: Directly via the venv Python path (Without entering the folder)

/path/to/your/crypto_toolkit/venv/bin/python /path/to/your/crypto_toolkit/crypto.py --encrypt ~/file.txt