BruXOR

We are given this sequence of characters:

TCQ{rveyln'bH_varHuebcrqxetrHOXEj  

We are told that the encryption type is XOR, but we need to guess the key. For that purpose, we can perform a brute force attack using “XOR Brute Force” module from CyberChef. If we filter by CTFlearn, we get the key and the flag:

Flag: CTFlearn{y0u_Have_bruteforce_XOR}.