: Use the search query filename:writeup.txt "code black" 2021 to find raw text files in public repositories.
: A summary of various write-ups from this 2021 event is hosted on Scribd , though specific "Code Black" files may require a subscription to view.
: Search the CTFtime archive for "Black" or "Code Black" filtered by the year 2021.
: This was a notable cryptography/pwn challenge. A detailed write-up and the underlying code logic (Python) can be found on the Black Bauhinia site .