One of our problem writers got sent back in time! We found a piece a very very old piece of parchment where he disappeared, alongside a long cylinder. See if you can uncover his flag!
Just put it in dcode.fr’s cipher identifier —> Scytale cipher
Make sure to check “Keep punctuation and spaces”, and then just click brute force!
bcactf{5c7t4l3_h15t04y_qe829xl1}