Topic: Bitcoin puzzle transaction ~32 BTC prize to who solves it - page 14. (Read 187143 times)

0x4074a46512e55c9559cb8af86c983bc424d9f2d5fbb3c14b65b1045d21972d219b359a24806826a94c72e9a95ca00dab

SHA256(privateKey + "some secret value")

from cryptography.fernet import Fernet
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
import base64
import os
import getpass

# Function to generate a key from the password
def key_from_password(password, salt):
    kdf = PBKDF2HMAC(
        algorithm=hashes.SHA256(),
        length=32,
        salt=salt,
        iterations=100000,
        backend=default_backend()
    )
    key = base64.urlsafe_b64encode(kdf.derive(password.encode()))
    return key

# Encrypt the message
def encrypt_message(message, password):
    salt = os.urandom(16)
    key = key_from_password(password, salt)
    fernet = Fernet(key)
    encrypted = fernet.encrypt(message.encode())
    return encrypted, salt

# Decrypt the message
def decrypt_message(encrypted_message, password, salt):
    key = key_from_password(password, salt)
    fernet = Fernet(key)
    try:
        decrypted = fernet.decrypt(encrypted_message).decode()
        return decrypted
    except Exception as e:
        return "Error: " + str(e)

# Main interface
if __name__ == "__main__":
    choice = input("Do you want to encrypt or decrypt a message? (encrypt/decrypt): ")
   
    if choice == "encrypt":
        secret_message = input("Enter your secret message: ")
        password = getpass.getpass("Enter a password for encryption: ")
        encrypted_message, salt = encrypt_message(secret_message, password)
        print("Your encrypted message is:")
        print(encrypted_message.decode())
        print("Your salt (needed for decryption) is:")
        print(base64.b64encode(salt).decode())
    elif choice == "decrypt":
        encrypted_message_input = input("Enter the encrypted message: ")
        salt_input = base64.b64decode(input("Enter the salt: "))
        password = getpass.getpass("Enter the password for decryption: ")
        decrypted_message = decrypt_message(encrypted_message_input.encode(), password, salt_input)
        print("Your decrypted message is:")
        print(decrypted_message)
    else:
        print("Invalid choice. Please type 'encrypt' or 'decrypt'.")