In the field of computer security, the CTF (Capture the Flag) is as acompetition organized in the form of a challenges where the objective is to findto find and/or exploit computer vulnerabilities affecting software, websites or software, websites or computer systemsor computer systems in order to get in andto get in and get a flag(flag in French), proof of theof the player's success.

The Midnight Flag CTF is the annual cybersecurity competition organized by ESNA students.