🔐 Cryptographic Application

This is a Python-based cryptographic application that supports encryption, decryption, and hashing using both classic and modern algorithms. It provides two interfaces for interaction:

• A RESTful API built with Flask and FastAPI, documented using Swagger UI
• A Streamlit frontend for a more visual, user-friendly experience

It also supports file-based cryptographic operations, such as hashing and digital signatures.

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🚀 Features

🏛️ Classic Ciphers

• Caesar Cipher – supports custom shift keys and optional custom alphabets
• Vigenère Cipher – supports customizable keyword input

🔐 Modern Cryptography

• SHA-256 hashing
• RSA encryption/decryption
• RSA key pair generation
• Digital signing and signature verification

🖥️ Interfaces

• REST API (via Flask + FastAPI)

  • Accessible and interactive via Swagger UI
  • Easy testing through Postman or curl

• Streamlit Frontend

  • Clean UI for selecting algorithms, entering inputs, and viewing results
  • Choose cipher or algorithm
  • Input message, key, and view result

• Testing

  • Unit tests for all ciphers using various inputs

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⚙️ Installation

1. Clone the repository

git clone https://github.com/Tynoee/Security-and-Cryptography.git
cd Security-and-Cryptography

2. Install dependencies

pip install -r requirements.txt

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🧪 Running the Application

Launch the REST API (FastAPI via Uvicorn)

uvicorn main:app --reload

• Swagger documentation: http://127.0.0.1:8000/docs
• ReDoc (optional): http://127.0.0.1:8000/redoc

Launch the Streamlit UI

streamlit run streamlit_app.py

• Opens at: http://localhost:8501

✅ Run Tests

python -m unittest discover -s tests

📦 Dependencies

cryptography>=42.0 pycryptodome>=3.20 fastapi>=0.110.0 uvicorn[standard]>=0.27.0 streamlit>=1.30.0 python-multipart