Day of talk: September 17, 2021
You might also want to read: My article about defensive CTF
For BSides København CTF 2021, I was a part of the team developing a couple of defensive CTF challenges. My talk at the conference covered the basic concept consisting of having the participants analyze the code/application, then have them solve the vulnerability, and finally get validated if their solution is effective.
The conference: BSides København 2021