Have you, by any chance, figured out how to get to zone 4? Where you had to solve the crypto part? I've tried checking to see if it was a hash, tried brute forcing it, tried to think it out and noticed that the first part in both ciphertext's (20d916c6c29ee5) are the same...I just can't figure this one out. I don't want the answer, but I'm trying to learn and I was hoping someone could point me in the right direction. Thanks!