Cryptography Challenge 4 - Mirror

Prompt

A hidden flag is encoded in this message. It is possible that it should not be read from left to right.

Answers

Q1 (40 pts) - 2Pyhu6GrvrO8s/Krsby3p6O3oLTyuqa7pfKhor63uvKmp7DypryzpLe+t6Cgu/Khu/KmvLemvL2x8re6pvK0vfKmobeg8re6htj84uPm4f+Dn5uG/4uZgfLotbO+tPK3uqbyvrO3pLeg8r6+u6Xyobuhq76zvLPyvqe0t6Czkdj8t76ws7azt6Dytryz8r6zoKems7zyub29vvK9pvK2t7y1u6G3tvKgt76+u7TypqGnuPKhu/Kmqrem8qG7uqbytL3ypqG9n9j8t7WzoaG3v/K8t7a2u7rys/Kht7u+8rqis6C1s6CzovKroLO8u7agvfK3obuloLe6pr3yobu6pvK0vfK3vra2u7/yt7qm8ryb
SKY-TIMQ-3410

Steps I Took

I started in CyberChef. I used Decode from Base64 and got the following result:

I used XOR brute force to test the possible keys, since I did not have a clear way to determine the key directly. The f2 key produced readable English text.

I reversed the text first, then replaced XOR Bruteforce with XOR and used f2 as the key to recover the answer.

I originally solved it a different way, but the page refreshed and generated a new prompt, so I had to solve it again with the method above.