The encryption and decryption process described in the provided code uses RSA (Rivest-Shamir-Adleman), which is an asymmetric encryption algorithm. This means it uses two different keys: a public key for encryption and a private keyfor decryption.

Here's a breakdown of how the encryption process works :

Python

1. Import Required Libraries

   # Import all lib ...
   import base64
   import json
   from Crypto.PublicKey import RSA
   from Crypto.Cipher import PKCS1_OAEP
   

2. Load the public key

   def load_public_key(public_key_path):
       with open(public_key_path, 'rb') as pub_file:
           public_key = RSA.import_key(pub_file.read())
       return public_key
   

3. Load the private key

   def load_private_key(private_key_path):
       with open(private_key_path, 'rb') as priv_file:
           private_key = RSA.import_key(priv_file.read())
       return private_key
   

4. Encrypt data using the public key

   def encrypt_data(data, public_key_path):
       public_key = load_public_key(public_key_path)
       cipher_rsa = PKCS1_OAEP.new(public_key)
       encrypted_data = cipher_rsa.encrypt(data.encode())
       return base64.b64encode(encrypted_data).decode('utf-8')
   

5. Decrypt data using the private key

   def decrypt_data(encrypted_data, private_key_path):
       encrypted_data_bytes = base64.b64decode(encrypted_data)
       private_key = load_private_key(private_key_path)
       cipher_rsa = PKCS1_OAEP.new(private_key)
       decrypted_data = cipher_rsa.decrypt(encrypted_data_bytes)
       return decrypted_data.decode()
   

6. Example usage

   public_key_path = 'path_to_public_key.pem'.
   private_key_path = 'path_to_private_key.pem'
   
   # Encrypt some data
   data_to_encrypt = "Hello, this is a test message!"
   encrypted_data = encrypt_data(data_to_encrypt, public_key_path)
   print(f"Encrypted Data: {encrypted_data}")
   
   # Decrypt the data
   decrypted_data = decrypt_data(encrypted_data, private_key_path)
   print(f"Decrypted Data: {decrypted_data}")
   

   Explanation:

   • load_public_key: Loads the RSA public key from a file.
   • load_private_key: Loads the RSA private key from a file.
   • encrypt_data: Encrypts the provided data using the public key.
   • decrypt_data: Decrypts the encrypted data using the private key.

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