picoCTF 2022 Vigenere (Cryptography 100 points)

The challenge is the following,

We are also given the file cipher.txt which contains,

rgnoDVD{O0NU_WQ3_G1G3O3T3_A1AH3S_a23a13a5}

I went to CyberChef and used Vigenere decode with the key CYLAB, which gave,

Therefore, the flag is,

picoCTF{D0NT_US3_V1G3N3R3_C1PH3R_y23c13p5}

Original writeup (https://github.com/LambdaMamba/CTFwriteups/tree/main/picoCTF_2022/Cryptography/Vigenere).