Editing Capture the flag (section)

===Computer security===
[[File:DEF CON 17 CTF competition.jpg|thumb|A team competing in the CTF competition at [[DEF CON]] 17]]
{{Main|Capture the flag (cybersecurity)}}
{{See also|Wargame (hacking)}}

In [[computer security]] Capture the Flag (CTF), "flags" are secrets hidden in purposefully-vulnerable programs or websites. Competitors steal flags either from other competitors (attack/defense-style CTFs) or from the organizers (jeopardy-style challenges).<ref>{{Cite web |title=An Introduction to Cybersecurity, Capture the Flag Contests, and Basic Security Concepts |url=https://medium.com/better-programming/an-introduction-to-cybersecurity-capture-the-flag-contests-and-basic-security-concepts-80f3fbf62bbc |last=Dubey |first=Siddhant |date=2019-12-01 |publisher=Medium |language=en |access-date=2020-05-21 |archive-date=2020-05-21 |archive-url=https://web.archive.org/web/20200521222110/https://medium.com/better-programming/an-introduction-to-cybersecurity-capture-the-flag-contests-and-basic-security-concepts-80f3fbf62bbc |url-status=live }}</ref><ref>{{cite journal |last1=Švábenský |first1=Valdemar |last2=Čeleda |first2=Pavel |last3=Vykopal |first3=Jan |last4=Brišáková |first4=Silvia |title=Cybersecurity knowledge and skills taught in capture the flag challenges |journal=Computers & Security |date=March 2021 |volume=102 |issue=102154 |page=102154 |doi=10.1016/j.cose.2020.102154 |url=https://www.sciencedirect.com/science/article/pii/S0167404820304272 |arxiv=2101.01421 |s2cid=230523819 |access-date=2021-02-04 |archive-date=2022-01-21 |archive-url=https://web.archive.org/web/20220121043109/http://www.sciencedirect.com/science/article/pii/S0167404820304272 |url-status=live }}</ref><ref>{{Cite web|url=https://ctftime.org/ctf-wtf/|title=CTFtime.org / What is Capture The Flag?|website=ctftime.org|access-date=2023-03-06|archive-date=2023-02-24|archive-url=https://web.archive.org/web/20230224112858/https://ctftime.org/ctf-wtf/|url-status=live}}</reF> Several variations exist, including hiding flags in hardware devices.