death_of_privacy_2019

#!/usr/bin/env python3
# File Name: Death of Privacy (2019)
# Author: Python253

"""
Cicada3301 Decryption Script

This script decrypts the final provided Cicada3301 ciphertexts using the CAST-5 algorithm
with the key "EMERGE" and displays the decrypted messages in the terminal.

Requirements:
- Python 3
- PyCryptodome library (install using: pip install pycryptodome)

Usage:
1. Ensure the required libraries are installed.
2. Run the script.

Additional Notes: https://pastebin.com/TbkHwySL
"""

from Crypto.Cipher import CAST
from base64 import b64decode

def decrypt_ciphertext(ciphertext, key):
    cipher = CAST.new(key.encode(), CAST.MODE_ECB)
    decrypted_message = cipher.decrypt(b64decode(ciphertext)).decode('utf-8')
    return decrypted_message.rstrip('\x00')  # Remove padding

# Key
key = "EMERGE"

# List of ciphertexts
ciphertexts = [
    "RyKG0fBRAcIn66bQ3CQlX2dWV6+lVQYFcGsKBEP9u8gY37ISHDeI+hKgXhAhtFAzUwsh6Q59+1ZS XysGEgIyvw4I2QEcSOWh",
    "9Ry/lPbEbM91PFu5heorJtoQEj8hQM/9+6FIxibhb0Tq4cFl57Bij0HpAmwsAkZ2rojayosu+vul p8x4BvTq6CGEamFVzcfz1lp1RfiiN2aSK3mLILtgOwUDEcqwhH3WXen8ptUDuphzQ62RVtunLQ==",
    "xcoCxZCMWAmVA3Xx20FgF8ZDRqoyoOEwB1FyAkgJNv9+6RncUSTmz1tv+IJBeGvg",
    "q9C74tNACOd3YH+SzcF6WoKh4CvksBEf4bBvExprALZVpej3xjE7oEpSbnSSrkgCI7BCBS0YpQo+ qOzgMw2hTQ==",
    "wIbxQAJETCSYuia9HKyLnukC7dlLw3+kFTLSUM+fAFS8fvDnD+ON2wVivtB4JSjgLfnDZvpxl1ey veIOBrIIjQ==",
    "4mP0eNt9/bplWXxygP7tspRKpdgyQA4h9ubvUMnNxUM8nBEhr49IP8Nrf9zS/lw9ercJPF8gySRc O312c6x+4KgCPFBLR+sl3M97mDKNDiDFaMMqNtaUltsefk22VKq4Pqjs4DMNoU0=",
    "r3S0H+SW0CwfyiRiB0vSYOYVzpYEIepjvYN/rdOM6sdlT1j0E8amkNsQ3rnMS6AkGh5iOTnbYFlr 0tZIAfcNLrFw48tsKmUv",
    "/U5ofW6tQt8xqLc9mbuI9uF3KSmJacGmnh0xmaoK6KeIob+yTvIUcg==",
    "/U5ofW6tQt/u61bbwtLpclx67PEq6Wjy"
]

# Decrypt and display messages
for i, ciphertext in enumerate(ciphertexts, start=1):
    decrypted_message = decrypt_ciphertext(ciphertext, key)
    print(f"{i}:\n{decrypted_message}\n")