Python Simple Encrypt Decrypt String

Chapter: Python Last Updated: 24-09-2023 03:02:00 UTC

Program:

            /* ............... START ............... */
                
from cryptography.fernet import Fernet

# Generate a random key for encryption
def generate_key():
    return Fernet.generate_key()

# Encrypt a string using a key
def encrypt_message(key, message):
    cipher_suite = Fernet(key)
    encrypted_message = cipher_suite.encrypt(message.encode())
    return encrypted_message

# Decrypt a string using a key
def decrypt_message(key, encrypted_message):
    cipher_suite = Fernet(key)
    decrypted_message = cipher_suite.decrypt(encrypted_message)
    return decrypted_message.decode()

# Example usage
if __name__ == "__main__":
    # Generate a key (keep it secret and safe)
    secret_key = generate_key()
    
    # Message to be encrypted
    message_to_encrypt = "Hello, World!"
    
    # Encrypt the message
    encrypted_message = encrypt_message(secret_key, message_to_encrypt)
    print("Encrypted Message:", encrypted_message)
    
    # Decrypt the message
    decrypted_message = decrypt_message(secret_key, encrypted_message)
    print("Decrypted Message:", decrypted_message)

                /* ............... END ............... */
        

Notes:

  • Encrypting and decrypting a string in Python can be done using various encryption algorithms and libraries. One simple way to achieve this is by using the cryptography library, which provides a high-level interface for various cryptographic operations. Here's an example of how to encrypt and decrypt a string using the Fernet symmetric encryption scheme from the cryptography library:
  • First, you need to install the cryptography library if you haven't already. You can install it using pip: pip install cryptography
  • In this example, we generate a random key, use it to encrypt a message, and then use the same key to decrypt the message. Make sure to keep your encryption key secure, as it's necessary to decrypt the message.
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