CCSC 2021 Capture the Flag Competition

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1st - 18th APRIL


Cyprus Computer Society (CCS) and CYberMouflons proudly present the Cyprus Cyber Security Challenge (CCSC) 2021! CCSC is a Jeopardy style Capture the Flag (CTF) competition open to all Cypriot citizens. The challenges - carefully crafted by CCSC mentors - span a variety of Cyber Security topics such as Cryptography, Pwn, Reverse Engineering, Web Exploitation, Forensics and Steganography.

Engage in more than two weeks full of hacking, test your skills and win awesome prizes but also a chance to secure a spot in the National Cyber Security Team of the European Cyber Security Challenge (eligibility criteria apply)! Pre-existing knowledge is not required, therefore even if you don't feel competitive, join and share the fun with us!

Competition has started but registrations are still open! You see the live scoreboard at:


The competition will run on CyberRanges platform. Registered participants will receive an email with instructions on how to proceed from there. In addition make sure that you join our discord server for real-time support, and chit-chat with CYberMouflons/CCSC mentors. Don't be shy.

Every problem has an assigned point value, which is usually representative of our perceived difficulty of the problem. Your total score is the sum of the points you obtain from every problem you solve. In case of ties, the time taken to solve the challenges will be used as the tie-breaker. There are no bonus points, so do not attempt to find hidden flags outside of the challenges. During the CTF, the scoreboard will display the ongoing scoreboard. After the competition ends, we will announce the winners, award the prizes and invite for interviews for joining the national European Cyber Security Challenge team (only applicable to eligible participants). Note that all participants are eligible for prizes regardless ECSC eligibility.

All communications during the competition will be conducted through our Discord server. These are, announcements, IT support, hints and Q and As. Use the button below of the invitation in your inbox address to join the discord server. Further instructions will be sent out to registered users via email when the competition approaches. Note that registration will remain open for the duration of the competition.



Thanks to our sponsors, apart from the opportunity to secure a spot in the national team for European Cyber Security Competition (ECSC), top contestants will also be awarded with generous prizes! There is an existing prize pool of more than 3400 EUR and more prizes are yet to be announced!

1st Place

- PEN-200 course + 30 days lab access + OSCP exam certification fee (850 EUR)

2nd Place

- PEN-200 course + 30 days lab access + OSCP exam certification fee (850 EUR)

Next 1st ECSC eligible participant

- PEN-200 course + 30 days lab access + OSCP exam certification fee (850 EUR)

Next 2nd ECSC eligible participant

- PEN-200 course + 30 days lab access + OSCP exam certification fee (850 EUR)

3rd-4th Place

- Raspberry Pi 4 Model B 2GB

5th - 8th Place

- 1 Raspberry Pi Pico and 1 Arduino Mega 2560 Compatible - Pro Version

First two players that solve all pwn challenges

First player who solves all web challenges

First Timer?

Never participated in a CTF before? Need a skills refresher? No problem! We got your back! It is highly recommended to try out last year's challenges at:

In addition, you are encouraged to take a free Cybersecurity introdoctury course by SCP:
Introduction to Cybersecurity.


  • [+] Use common sense. If you feel like what you're doing is disrupting the competition in any way, STOP doing it. Don't wait for us to yell at you.
  • [+] Don't post flags or solutions to challenges in public places before the CTF has ended. This will ruin the fun for everyone else. Solutions / write-ups will be posted at the end and we welcome submissions from participants.
  • [+] Do not try and attack other participants.
  • [+] Do not attack the scoreboard infrastructure. Do not attack the or the domains.
  • [+] Do not carry out Denial-of-Service attacks.
  • [+] Do not carry out brute-force attacks.
  • [+] Any kind of challenge chatter inside or outside this server is prohibited. Any challenge related questions can be directed to one of the mentors/challenge authors.
  • [+] Be nice. Don't use profanity. Don't spam. Don't harass. Do not discriminate against age, race, gender, religion, nationality, ethnicity, sexual orientation, choice of Linux distro or anything else.
  • [+] If you break any of these rules, you could be disqualified. Decisions made by competition organizers are final.
  • [+] Flag format is CCSC{...} unless stated otherwise.
  • [+] Participation in the ECSC national team is only available to Cypriot nationals that are born from 1995-2007 inclusive (14-26 years old).
  • [+] Prize eligibility is only limited to contestants that can prove Cypriot nationality or permanent residence. For some prizes the ECSC eligibility must also be satisfied.

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