I will post three hints over the course of 3 hours to make it easier.
Hint 1: 64+64=
Hint 2: It has 3 layers of encryption figure them out.
I'm guessing the first hint means you used 128-bit encryption, which will be basically impossible to decrypt barring use of a super computer.
This isn't even a 'challenge' really. You used ciphers that are impossible to reverse without a massive brute force attack.
Go learn how cryptography works and then come back with something that's actually solvable.