🧠 CyberCrypt

CyberCrypt is a secure, educational file encryption tool developed for the 2024–2025 Talent Exhibition as part of the BTS Cloud & Cybersecurity program at Lycée Guillaume Kroll.

It provides a hands-on experience in modern cryptographic techniques including AES, RSA, KDFs, and secure file handling – all wrapped in a user-friendly web interface powered by Streamlit.

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🚀 Getting Started

1. Clone the repository:

   git clone https://github.com/DiogoF-Hub/CyberCrypt.git
   cd CyberCrypt
   pip install -r requirements.txt
   streamlit run Home.py
   

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🔐 Features

• Encrypt and decrypt files using AES-256 (CBC mode)
• Secure AES keys using RSA (2048–4096-bit) encryption
• Generate AES keys:
  • Randomly
  • Derived from a password using PBKDF2 or Argon2id (with salt)
• View detailed file structure and cryptographic process
• Easy-to-use Streamlit interface

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⚙️ Technologies Used

• AES-256 (CBC mode) – symmetric file encryption
• RSA – public key encryption for AES key protection
• PBKDF2 and Argon2id – secure password-based key derivation
• Python 3.11+
• Streamlit – front-end web framework

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🔄 How It Works

1. Upload a file to encrypt
2. Choose between:
   • Password-based encryption (with salt and KDF)
   • Random AES key generation
3. CyberCrypt:
   • Encrypts the file using AES
   • Encrypts the AES key with your RSA public key
4. Outputs:
   • Encrypted file
   • Encrypted AES key (and salt, if applicable)

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📁 File Format

💃 Encrypted Data File

[2-byte filename length] + [original filename (bytes)] + [IV (16 bytes)] + [AES-encrypted content]

• Filename is stored to preserve the original name after decryption.
• IV (Initialization Vector) is required for AES-CBC mode.

🔐 Encrypted AES Key File

[RSA-encrypted AES key (256–512 bytes)]

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✍️ Author: CARVALHO Diogo – BTS Cybersecurity | Lycée Guillaume Kroll – 2024–2025 Talent Exhibition