This challenge gave us a .txt file containing the following encrypted message:
rgnoDVD{O0NU_WQ3_G1G3O3T3_A1AH3S_f85729e7}
The clue gives us the key “CYLAB”, which should produce the flag for us when we put it into an online Vignere decryption tool.
This produces the flag: picoCTF{D0NT_US3_V1G3N3R3_C1PH3R_d85729g7}