ARC4 Cipher

Success is how high you bounce when you hit bottom.

– George S. Patton

from Crypto.Cipher import ARC4
from Crypto.Util.number import bytes_to_long, long_to_bytes
import os
key = long_to_bytes(os.getenv("CTF4_KEY"))
cipher = ARC4.new(key)
encrypted = cipher.encrypt(b'{"username": "user1"}')
print(bytes_to_long(encrypted))
# 333313617519863333421697234237430807583198432342730