Mission

We have a string e4uo{zo1b_1e_f0j4l10i}z0ce. And they used several rotations on it. By looking at it and assuming that the numbers stay the same I immediately noticed “th1s_1s_…”. And since the flag format is d4rk{...}c0de we only have one word left to crack. f0j4l10i, for this I downloaded a list with 30000 8 letter words and ran a grep serach with wildcards on them.
Mission

There I noticed rotation and knew this was the word I was searching for! Putting it together we get the flag: d4rk{th1s_1s_r0t4t10n}c0de