$ ctf -h
Grey Cat The Flag is an annual CTF hosted jointly by NUS Greyhats and Division Zero (Div0), supported by the National Cybersecurity R&D Lab.
Remember to stay tuned to our socials to stay updated!
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.
$ stat ctf
There will be two categories this year
Local Category consists of: NSFs, students that are currently enrolled in an educational institute in Singapore (team should consist of at least one Singapore Citizen)
Open Category consists of: all participants who do not qualify for the local category, participants who are eligible for the local category but opts in for the open category
There will be an onsite finals for the top 20 teams in the local category. Each team may send up to 4 people for the onsite finals.
Regrettably, we are unable to accommodate international teams for the onsite finals this year.
On the bright side, we will have attractive cash prizes up for grabs the top 3 teams in our Grey Cat The Flag Open category.
$ stat summit
We are excited to announce that we are hosting our very own Summit this year in Singapore!
This event will include talks and workshops on cybersecurity, with plenty of chances to meet new people during breaks and over lunch and tea.
Plus, you will have the opportunity to hear from our sponsors as well as concluding with the CTF prize presentation.
We hope that you will join us for this fantastic summit!
The summit will happen on 10th August, from 1000h to 1630h (SGT) at NUS COM1 Level 2.
| Time | Event |
|---|---|
| 1000h - 1015h | DSTA Talk |
| 1015h - 1030h | DSO Talk |
| 1030h - 1045h | ISD (MHA) Talk |
| 1045h - 1100h | Prize Presentation |
| 1100h - 1130h | Talk 1 - ? |
| 1130h - 1200h | Talk 2 - ? |
| 1200h - 1330h | Lunch & Networking |
| 1330h - 1400h | Talk 3 - ? |
| 1400h - 1600h | Workshop - ? |
| 1600h - 1630h | Closing Ceremony |
Concurrently, we will have some booths and activities happening in parallel with the talks that includes (but is not limited to):
- Hardware Hacking
- Lock Picking
- many more…
$ where ctf
| dates | events |
|---|---|
| 20th April, 12pm (GMT+8) to 21st April, 12pm (GMT+8) | Qualifiers, Online |
| 27th July, 10am (GMT+8) to 28th July, 10am (GMT+8) | Finals @ NUS COM1 |
| 10th August, 10am (GMT+8) to 10th August, 4.30pm (GMT+8) | GCTF Summit @ NUS COM1 |
$ man prize
open category
| ranking | prize |
|---|---|
| 1st place | SGD 2000 |
| 2nd place | SGD 1000 |
| 3rd place | SGD 400 |
local category
| ranking | prize |
|---|---|
| 1st place | SGD 4000 |
| 2nd place | SGD 2000 |
| 3rd place | SGD 1000 |
| 4th-10th place | SGD 400 |
| special prizes | stay tuned! |
$ whois sponsors
We would like to extend our heartfelt gratitude to our sponsors .
Platinum Sponsor
Gold Sponsor
Silver Sponsor
$ FAQ
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 4 members for the finals.
Q: What categories are there?
A: Web, Pwn, Crypto, RE, Blockchain, 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{...}
$ history
Past Winners
2023
| ranking | team |
|---|---|
| 1st place | r3kapig |
| 2nd place | DiceGang |
| 3rd place | Social Engineering Experts |
2022
| ranking | team |
|---|---|
| 1st place | catssg |
| 2nd place | nushmellows |
| 3rd place | Stranglehold |
Past Sponsors
