Introduction to AES256 Encryption

AES256 (Advanced Encryption Standard 256-bit) is a symmetric encryption algorithm widely used for securing sensitive data. AES256 is known for its strength and performance, and it’s one of the most popular encryption standards in use today.

Getting Started with AES256

In this guide, we will explore various AES256 APIs with examples. We aim to provide a comprehensive resource for developers to quickly understand and implement AES256 in their applications.

API Examples

1. Encrypt Data

  ```python
  from Crypto.Cipher import AES
  from Crypto.Util.Padding import pad

  key = b'Sixteen byte key'
  cipher = AES.new(key, AES.MODE_CBC)
  ct_bytes = cipher.encrypt(pad(b'secret data', AES.block_size))
  ```

2. Decrypt Data

  ```python
  from Crypto.Cipher import AES
  from Crypto.Util.Padding import unpad

  key = b'Sixteen byte key'
  cipher = AES.new(key, AES.MODE_CBC)
  pt = unpad(cipher.decrypt(ct_bytes), AES.block_size)
  ```

3. Generate a Random Key

  ```python
  from Crypto.Random import get_random_bytes

  key = get_random_bytes(32)  # 256-bit key
  ```

4. Save and Load Keys

  ```python
  import base64

  def save_key(key, filename):
      with open(filename, 'wb') as f:
          f.write(base64.b64encode(key))

  def load_key(filename):
      with open(filename, 'rb') as f:
          return base64.b64decode(f.read())
  ```

App Example: Secure Messaging

Below is an example of a simple secure messaging application using AES256 encryption.

  ```python
  from Crypto.Cipher import AES
  from Crypto.Util.Padding import pad, unpad
  from Crypto.Random import get_random_bytes

  def encrypt_message(message, key):
      cipher = AES.new(key, AES.MODE_CBC)
      ct_bytes = cipher.encrypt(pad(message.encode(), AES.block_size))
      return cipher.iv + ct_bytes

  def decrypt_message(encrypted_message, key):
      iv = encrypted_message[:AES.block_size]
      ct = encrypted_message[AES.block_size:]
      cipher = AES.new(key, AES.MODE_CBC, iv=iv)
      pt = unpad(cipher.decrypt(ct), AES.block_size)
      return pt.decode()

  # Example usage
  key = get_random_bytes(32)
  message = "Hello, World!"
  encrypted_message = encrypt_message(message, key)
  decrypted_message = decrypt_message(encrypted_message, key)

  print("Original message:", message)
  print("Decrypted message:", decrypted_message)
  ```

This app demonstrates the encryption and decryption of messages using securely generated AES256 keys.

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