Cybersecurity challenge 404 CTF

From 16 May to 7 June 2026, the General Directorate for External Security (DGSE) and Télécom SudParis, in partnership with OVHcloud and VivaTechnology, are organising the fifth edition of the 404 CTF, France’s largest cybersecurity competition.

Following the success of previous editions, this new edition pays tribute to France’s leading engineers and scientists.

For three weeks, take on challenges designed by Telecom SudParis’s HackademINT cybersecurity club. Whatever your level, rise to the challenge!

Open to everyone, the competition offers a fun immersion into the key areas of cybersecurity, whilst promoting the talents of tomorrow.

Registration opens: Thursday 30 April 2026 at 8pm

The top participants will be rewarded at the Viva Technology trade fair, which takes place this year from 17 to 20 June.

This competition forms part of the joint initiatives led by the DGSE and Télécom SudParis to promote talent and address issues related to digital sovereignty.

→ Registration will remain open for the duration of the competition.