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Since this is the top comment at the moment: CTF stands for Capture The Flag.

Personally I have never, ever heard that concept referred to by the initialism. Granted, it's almost never come up in my circles, so... shrug

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CTF is a game mode for popular online games like halo (or at least, that's how I know it), so paragraphs like

> My first CTF was HCKSYD, a 48-hour solo CTF. I full solved it and won in 2 hours. I was completely hooked. That led me to win DownUnderCTF, Australia's largest CTF, with Blitzkrieg multiple times. Blitzkrieg was one of Australia's strongest teams at the time. I later joined TheHackersCrew, an international top-tier team that was consistently ranked highly on CTFTime, the main global ranking and event calendar the scene uses as its scoreboard. With them, I competed in some of the most prestigious CTFs in the world, consistently placing well within the top 10 until the end of 2025.

Are still completely nonsensical to even those that understand the acronym

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It's also a game people play in person as well. It's the same as the Halo version except you tag each other instead of shooting. It's really fun to play in big open areas with large teams.
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Yeah, but we have AI now, we don't need our blog posts to over explain or state what it all means to general audiences. The author name-drops a bunch of CTF events hosted by a variety of independent organizations and name-drops well-known teams.

To help everyone, this Capture The Flag is specifically Cybersecurity adjacent, there is a Wikipedia article on it as the top Google search result for me when searching "CTF". This is why the acronym is used, because searching for the full will get you to the wrong "sport" vs the cybersecurity one.

I don't want to explain what a CTF is. look at the Wikipedia article. It is there for a good reason.

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Just to give the actual answer, CTF in this context means a computer security competition. Generally the way they work, is you get some programs, and you have to hack them to get some string called the flag (e.g. maybe the server has a root owned file called flag, so you have to get root somehow to read the file). Team with the most flags at the end wins.

In this context, CTF is almost exclusively referred to by the initialism, i think to help distinguish from other uses of the term.

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Which acronym do you mean? CTF? I think that acronym, just like BGP, is more well known by itself than what it stands for.

More generally, not every piece of writing is meant for every audience. Like if someone writes a blog post about CTFs aimed at people who like CTFs, nobody in the target audience needs to have CTF explained to them. Ultimately HN is a link aggregator, but sometimes its a bit like eavesdropping on a conversation. When you are just listening in you don't get the full context sometimes.

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I dont know what CTF stands for so I dont know if I am interested in this article or learning anything about it. Maybe I am.

Are you really arguing for not just typing out whatever 3 words this stands for once in the name of clarity?

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Yes, i would argue that people writing articles about niche interests aimed at other members of that niche are under no obligation to clarify it for people outside the niche.

They aren't your teacher. They aren't trying to send the content to you. They are just blogging on their own website for their own audience.

And its hardly unique to this article. If you are writing about the nitty gritty of linux networking, you probably aren't defining what TCP or UDP means. If you are writing a super detailed article comparing and contrasting plot structures of different animes, you probably aren't going to start by explaining what the word anime means. Etc

I'm not saying the world should be all RTFM, but if you are reading some sort of specialized content, then yes i think its a reasonable assumption that the reader has some basic background knowledge on the topic at hand, or is willing to do the research themselves.

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it's the first result I get on anonymous google search.

It's like complaining about not spelling C in "bake cake in 170 C"

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Best practice in writing about technical concepts is to spell out acronyms like this on their first use. There is a ton of stuff I learn about here on HN that I didn't know anything about before.

It doesn't help that the linked article never bothers to explain this either.

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Does spelling it out help? From memory, it is a security competition where participants compete to gain certain objectives. I think capture the flag may explain how scoring is kept, but it wouldn’t help me find out what it is, given that capture the flag is also just the name of a game people play outside by running, or in laser tag or in certain video games.
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For a general audience this is good advice.

This article was written for a specific audience who follows this blog because they know the term. If you start spelling out fundamental acronyms it makes the content look more basic and general.

This always upsets the general audience who stumble upon the article (like this) but it wasn’t meant for a general audience. CTF is extremely well known and the people who would be interested in this topic would wonder what’s happening if it was spelled out. It would be so odd that it would probably attract accusations of ChatGPT writing.

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> There is a ton of stuff I learn about here on HN that I didn't know anything about before.

But that is about you right? Its a little entitled to expect every piece of content on the internet to have a 101 explanation attached. If they were specificly aiming to have the blog post appear on HN that would be one thing, but they (presumably) weren't.

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When I encounter new terms, I look them up. Just like any other new word. Been doing it since I was a kid with a dictionary. Now, it’s too easy not to. There is literally no excuse.
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You could have just said “No”, if you had to say anything at all, rather than continuing the behavior.

Actively rude.

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What I see CTF I think Capture The Flag, Tribe player in me.
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CTF stands for "Capture The Flag" in the parent article. Just the security competition kind, not the FPS game kind.
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The annoying thing is even if you know what it means, multiple groups will use the same initialisms for different terms. So without more context you can’t know what it means.

It isn’t common but I feel it would be best when posting to HN to just expand the initialisms even if the source title didn’t.

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You can also over use the same initialism: ATM the ATM is connected via ATM
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Apart from everything else people have said in response to this, it's rude to presume that an article has HN as an audience simply by dint of it being available for us to link to. It's totally reasonable for people to write for an audience they know understands these terms.

So, in fact, you must not beg to have authors include courtesy definitions for you. That's not reasonable. Instead, you should simply ask here, on the thread, without complaining about the article.

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I didn't know what BGP is, but I did know CTF. YMMV
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I think so many acronyms have meaning that isn’t explained by the words that the stand for. The other day I was explaining what CI is and they asked what it stood for; I realized that Continuous Integration is almost completely useless for someone trying to understand what CI actually is
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Semantic names are great, but that's a separate issue. With the full term you can now go search for yourself and find explanations more easily.
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At the same time, I did a search for "what is a ctf to play" and got the answer. We know how to find answers to these problems. I agree the blog post was poor form.
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Your two paragraphs are completely contradictory. I agree with the first one.
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“hacker” news, ladies and gentlemen
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Let’s reduce this to absurdity:

I think you only wanted clarification of CTF (Capture the Flag) and not AI (Artificial Intelligence) and not GPT-4 (Generative Pre-Trained Transformer version 4) and not CLI (Command Line Interface) and not MCP (Model Context Protocol) and not LLM (Large Language Model)

Quoting TFA (The Fucking Article): “just adapt bro”

lol at the BGP example

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i try not to over feed tangents but this is precisely how i feel every time i speak to someone who is recently enlisted in the military. i have to constantly stop them and be like “i have no idea what you just said” over and over and over again. it’s like trying to make sense of a random bowl of alphabet soup.
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We live in the goddammed future. Huamnity's knowledge is at your fingertips. Right clicking the Nth word of the article and putting in any semblance of effort to learn on your own is too much to ask?

I don't know everything, there's tons of stuff I don't know about, but when I'm at my web browser, the least I can do about something is ask Google about a word or phrase or subject that isn't familiar instead of being spoonfed information like I'm a baby.

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