Thank you for joining us in the Orientation Showcase 2026 held on 01-Sep-2026. Without your active participation, this event will never be such successful.

We welcome you to join the Orientation Showcase 2026 on 1-Sep-2026! We will have even more CTF and ethical-hacking related demonstration and souvenirs in our booth.

Congratulations to our CTF Team on obtaining BOTH 1st-Runner Up AND 2nd-Runner Up in the Tertiary Category of “HKIRC Cyber Attack and Defence Elite Training cum Tournament 2026”.

The PolyU CTF Qualifier 2026/2027 will be held on 2-Oct-2026 to 4-Oct-2026. It will be a 48-hour jeopardy-style online CTF event.

Thanks again for your participation in the PolyU x NuttyShell Cybersecurity CTF 2026! The online competition has ended on 8-Mar-2026.

Congratulations to our CTF Team on obtaining BOTH 2nd-Runner Up in the Tertiary Institution Category AND Champion in Open Category in “HKCERT Capture the Flag Challenge 2025”.

Congratulations to our CTF Team on obtaining BOTH 2nd-Runner Up in the Tertiary Institution Category AND Champion in Open Category in “HKCERT Capture the Flag Challenge 2025”.

The PolyU x NuttyShell Cybersecurity CTF 2026 is coming soon in 6-8 March 2026! Stay tuned with us and we will see you in the competition!

Thanks for your participation in the PolyU CTF Qualifier 2025/2026! It has finally ended and we have recruited 10+ members to the team.

Thank you for joining us in the Orientation Showcase 2025 held on 28-Aug-2025. Without your active participation, this event will never be such successful.

The PolyU CTF Qualifier 2025/2026 will be held on 3-Oct-2025 to 5-Oct-2025. It will be a 48-hour jeopardy-style online CTF event.

We welcome you to join the Orientation Showcase 2025 on 28-Aug-2025! We will have even more CTF and ethical-hacking related demonstration and souvenirs in our booth.

Congratulations to our CTF Team on obtaining 4th-Runner Up in '2025 HackTheon Sejong International Collegiate Cyber Security Competition'.

Thanks again for your participation in the PolyU x NuttyShell Cybersecurity CTF 2025! The online competition has ended on 21-Apr-2025.

The PolyU x NuttyShell Cybersecurity CTF 2025 is coming soon in April! Stay tuned with us and we will see you in the competition!

Congratulations to our CTF Team on obtaining 2nd-Runner Up in the Open Category in 'HKCERT Capture the Flag Challenge 2024'.

Congratulations to our CTF Team on obtaining 2nd-Runner Up in the Tertiary Institution Category in 'HKCERT Capture the Flag Challenge 2024'.

Congratulations to our CTF Team on obtaining Champion in the CTF of the PwC’s Hack A Day 2024 – Securing Identity organized by PwC.

Thanks for your participation in the PolyU CTF Qualifier 2024/2025! It has finally ended and we have recruited 10+ members to the team.

The PolyU CTF Qualifier 2024/2025 will be held on 27-Sept-2024 to 29-Sept-2024. It will be a 48-hour jeopardy-style online CTF event.

Thank you for joining us in the Orientation Showcase 2024 held on 29-Aug-2024.

We welcome you to join the Orientation Showcase 2024 on 29-Aug-2024!

Thanks again for your participation in the PolyU x NuttyShell Cybersecurity CTF 2024! The online competition has ended on 3-Mar-2024.

The PolyU x NuttyShell Cybersecurity CTF 2024 will be held on 1-Mar-2024 to 3-Mar-2024.

Congratulations to our CTF Team on obtaining Champion in the HKUST Firebird CTF Competition 2024

These are the selected writeups for HKCERT CTF 2023.

Congratulations to our CTF Team on obtaining Champion in the Tertiary Institution Category in HKCERT CTF 2023.

Congratulations to our CTF Team on obtaining 2nd-Runner Up in the Tertiary Institution Category in HKCERT CTF 2023.

Congratulations to our CTF Team on obtaining Champion in the CTF of the PwC’s Hack A Day 2023

PolyU CTF Qualifier 2023/2024 has ended. We recruited 10+ new members.

PolyU CTF Qualifier 2023/2024 is coming soon!

Thank you for joining us in the Orientation Showcase 2023!

Our team will be at the Orientation Showcase 2023 on 30-Aug-2023.

NuttyShell Logo is now available!

Congratulations to our CTF Team on obtaining 2nd Runner Up in Greater Bay Area Cybersecurity Competition 2023.

Congratulations to NuttyShell on obtaining Champion in PwC's HackaDay 2022.

Congratulations to NuttyShell on obtaining 2nd Runner Up in HKCERT CTF 2022 (Open).

Congratulations to our CTF Team on obtaining Champion in HKCERT CTF 2022 (Tertiary).

Congratulations to NuttyShell on obtaining Champion in HackTheBoo CTF 2022.

PolyU CTF Qualifier 2022/2023 has ended. We recruited 8 new members.

PolyU CTF Qualifier 2022/2023 is coming soon!

CSAW CTF Qualification Round 2022 Writeup

Our team will be at the Orientation Showcase 2022 on 25-26 Aug 2022.

Congratulations to our CTF Team on obtaining 1st Runner Up in Cybersecurity Purple Team Competition 2022.

Congratulations to our CTF Team on obtaining 2nd Runner Up in PwC's HackaDay 2021.

Congratulations to our CTF Team on obtaining 4th Runner Up in HKCERT CTF 2021.

Congratulations to our CTF Team on obtaining 1st Runner Up in CyberSecurity Blue Team Competition 2021.

Congratulations to our CTF Team on obtaining 3rd Runner Up in PwC's HackaDay 2020.

Congratulations to our CTF Team on obtaining 1st Runner Up in HKCERT CTF 2020.