We found this note on someone’s key chain! It reads… ygqa{6y980e0101e8qq361977eqe06508q3rt}? There was another key that was engraved with the word QWERTY, too…

Keyed Caesar Cipher. Use QUERTY as key. Decode on https://www.boxentriq.com/code-breaking/keyed-caesar-cipher.

Flag: flag{6f980c0101c8aa361977cac06508a3de}

Original writeup (https://thomaspreece.com/2021/03/15/nathamcon-ctf-2021/#6-car-keys).