This is for users who want to decrypt without any further hints. No easy task. You can continue grinding away and when you are ready, answer all of the questions in Crypto Checkpoint 2 & 3 without using the hints. Remember, hints usage can be tracked through your profile.
This is for hard working users who are still stuck, yet determined to finish. We applaud your grit. You can continue on to Crypto Checkpoint 2 and feel free to explore the hints. The hints will give away information related to the encryption. Hopefully these hints will lead you towards the solution after which you can go on to Crypto Checkpoint 3.