cipher = AES.new(key, AES.MODE_CBC, iv) plaintext = cipher.decrypt(ciphertext) # Remove PKCS#7 padding pad_len = plaintext[-1] return plaintext[:-pad_len]
A popular game mod called Frosty Mod uses a custom encrypted configuration file ( frosty_config.bin ). The mod loader says: “Missing or invalid encryption key.” Your task: recover the hardcoded encryption key from the mod loader executable ( frosty_loader.exe ) and decrypt the config file.