$ ctf -h

Grey Cat The Flag is a CTF hosted by NUS Greyhats in collaboration with National Cybersecurity R&D Labs.

Register for the qualifiers @ ctfd.nusgreyhats.org

What is CTF?

CTF (Capture The Flag) is a kind of information security competition that challenges you to solve a variety of tasks ranging from a scavenger hunt on wikipedia to basic programming exercises, to hacking your way into a server to steal data. In these challenges, the contestant is usually asked to find a specific piece of text that may be hidden on the server or behind a webpage. This goal is called the flag, hence the name!

If you are new, don’t worry! We will be sharing resources in our Discord server every now and then.

Learn more about CTFs

$ stat ctf

We will host the onsite finals at the National University of Singapore (NUS), to which the top 5 international teams and the top 10 Singapore teams from the qualifiers will be invited.

Each team may send up to 6 people for the finals, and accommodation in Singapore will be provided for the international teams.

A team can be considered a Singapore team only if all its members participating in this CTF event are Singapore Citizens, Permanent Residents (PR), or Long-term Pass holders.

$ where ctf

19 May, 10pm (GMT+8) to
21 May, 10pm (GMT+8)
Qualifiers, Online
15 to 16 JulyFinals @ NUS

$ man prize

1st placeSGD 6000
2nd placeSGD 4200
3rd placeSGD 2400

$ whois sponsors

We would like to extend our heartfelt gratitude to our sponsors .


Join our Discord server if you have more questions.

Q: Is there a team size limit for qualifiers?

A: There is no team size limit for qualifiers. You can have as many team members as you want. However, please note that each team can only send up to 6 members for the finals.

Q: What categories are there?

A: Web, Pwn, Crypto, RE, Misc

Q: Is this CTF beginner friendly?

A: Yes! But we also have hard challenges for the stronger teams.

Q: What's the flag format?

A: grey{...}