Simple Encrytion Algorithim in python

OTHERS/Encryption/README.md

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+
+# 🔐 Simple Symmetric Encryption in Python
+
+This project demonstrates the basics of **symmetric encryption** using Python and the [`cryptography`](https://cryptography.io/en/latest/) library. It's a great starting point for beginners interested in **cybersecurity**, **cryptography**, or contributing to **open-source security tools**.
+
+---
+
+## 📚 What You'll Learn
+
+- How to generate secure keys
+- How to encrypt and decrypt messages
+- Basic key management (saving & loading keys)
+- How `Fernet` (AES-based encryption) works under the hood
+
+---
+
+## 🚀 Getting Started
+
+### 1. Clone the Repository
+
+```bash
+git clone https://github.com/your-username/simple-encryption-python.git
+cd simple-encryption-python
+```
+
+### 2. Install Dependencies
+
+Make sure you have Python 3.6+ installed.
+
+Install required package using `pip`:
+
+```bash
+pip install cryptography
+```
+
+### 3. Run the Code
+
+```bash
+python simple_encryption.py
+```
+
+On first run, it will generate a `secret.key` file that is used for both encryption and decryption. Each time you run the script, it:
+- Loads the existing key
+- Encrypts a sample message
+- Decrypts it back and displays the result
+
+---
+
+## 📂 File Structure
+
+```
+simple-encryption-python/
+│
+├── simple_encryption.py   # Main script to run encryption and decryption
+├── secret.key             # Auto-generated AES-based symmetric key (DO NOT SHARE)
+├── README.md              # Documentation
+```
+
+---
+
+## 🔒 Security Note
+
+This example is for educational purposes only. If you’re building a production-grade application:
+- Never store raw keys in plaintext
+- Use environment variables or secure vaults (e.g., AWS KMS, HashiCorp Vault)
+- Handle exceptions and errors securely
+
+---
+
+## 🧠 How It Works (In Brief)
+
+- **Fernet** is a module in the `cryptography` package that provides:
+  - AES-128 in CBC mode
+  - HMAC-SHA256 authentication
+  - Random IVs for each encryption
+
+- The encryption key is:
+  - Generated once and saved to `secret.key`
+  - Loaded on subsequent runs
+
+- The message is:
+  - Encrypted using `.encrypt()`
+  - Decrypted using `.decrypt()`
+
+---
+
+## 💡 Sample Output
+
+```
+[*] Key loaded from 'secret.key'
+
+Original Message: This is a secret message.
+Encrypted Message: b'gAAAAABlZ...'
+Decrypted Message: This is a secret message.
+```
+
+---
+
+## 🤝 Contributing
+
+Contributions are welcome! You can help by:
+- Improving the CLI interface
+- Adding file encryption support
+- Implementing password-based key derivation
+- Writing unit tests
+
+To contribute:
+1. Fork the repo
+2. Create a new branch (`git checkout -b my-feature`)
+3. Commit your changes
+4. Push and create a Pull Request
+
+---
+
+## 📜 License
+
+This project is licensed under the **MIT License**. See [LICENSE](LICENSE) for details.
+
+---
+
+## 👨‍💻 Author
+
+**Afolabi Adewale**  
+A data and security enthusiast exploring the intersection of Python, encryption, and open-source software.  
+[GitHub Profile](https://github.com/your-username)
+
+---
+
+## 🔗 Related Resources
+
+- [Python `cryptography` docs](https://cryptography.io/en/latest/)
+- [Understanding Symmetric vs Asymmetric Encryption](https://www.cloudflare.com/learning/ssl/how-does-ssl-work/)
+- [OWASP Crypto Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Cryptographic_Storage_Cheat_Sheet.html)

OTHERS/Encryption/symmetricEncryption.py

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+# simple_encryption.py
+
+"""
+A simple example of symmetric encryption using Python's 'cryptography' package.
+
+This script:
+1. Generates a secure encryption key
+2. Encrypts a message using the key
+3. Decrypts it back to the original message
+
+Author: Afolabi Adewale
+"""
+
+from cryptography.fernet import Fernet
+
+# 1. Generate a key for encryption and decryption
+def generate_key():
+    """
+    Generates a symmetric key for Fernet (uses AES encryption internally).
+    """
+    key = Fernet.generate_key()
+    with open("secret.key", "wb") as key_file:
+        key_file.write(key)
+    print("[+] Key generated and saved to 'secret.key'")
+    return key
+
+# 2. Load the existing key from file
+def load_key():
+    """
+    Loads the previously generated key from the file.
+    """
+    return open("secret.key", "rb").read()
+
+# 3. Encrypt a message
+def encrypt_message(message: str, key: bytes) -> bytes:
+    """
+    Encrypts a message using the provided symmetric key.
+    """
+    f = Fernet(key)
+    encrypted = f.encrypt(message.encode())
+    return encrypted
+
+
+# 4. Decrypt a message
+def decrypt_message(encrypted_message: bytes, key: bytes) -> str:
+    """
+    Decrypts an encrypted message using the same symmetric key.
+    """
+    f = Fernet(key)
+    decrypted = f.decrypt(encrypted_message)
+    return decrypted.decode()
+
+# 5. Main runner
+if __name__ == "__main__":
+    # Create or load the key
+    try:
+        key = load_key()
+        print("[*] Key loaded from 'secret.key'")
+    except FileNotFoundError:
+        key = generate_key()
+
+    # Example message
+    message = "This is a secret message."
+    print(f"\nOriginal Message: {message}")
+
+    # Encrypt it
+    encrypted = encrypt_message(message, key)
+    print(f"Encrypted Message: {encrypted}")
+
+    # Decrypt it
+    decrypted = decrypt_message(encrypted, key)
+    print(f"Decrypted Message: {decrypted}")