LakeCTF is a jeopardy-style security hacking contest organized by the polygl0ts CTF team (plus some friends!) and the EPFL School of Computer and Communication Sciences (IC).

You must first compete in an online qualification round, and then physically compete in the finals in Lausanne. The top teams will have the unique chance to meet the top members of the EPFL research community.

We wish you the best of luck !

Quals schedule

Qualification start Sat 4th of November, 18:00 UTC
Qualification end Sun 5th of November, 18:00 UTC

Finals schedule

Fri 27th of April 2024 Arrival
Tour of Lausanne
Sat 28th of April 2024 9:00 CTF Finals Start
17:00 End and Award ceremony
18:00 Apero to meet with EPFL security professors and researchers.


CTF Finals INM 065 at EPFL
Hotels Ibis Styles Lausanne Center
Moxy Hotel




As of now, there will be no prizes for the qualifications.
However, all teams that qualify for the finals will have accommodation paid by EPFL and every team member will receive the following prizes :

🥇 First place TBD
🥈 Second place TBD
🥉 Third place TBD

Bonus rewards:

Best 5 writeups TBD

All finalist teams will receive a bag of EPFL and polygl0ts merch.


LakeCTF's first edition on the special occasion of the 20 years anniversary of the IC School (Computer and Communication Sciences). It will take place on the EPFL Campus in Lausanne, Switzerland.

In colllaboration with the IC School, accommodation, a the tour of Lausanne, lunch and dinner are provided for the finals.


polygl0ts is the official EPFL CTF team. It was born in 2018 and is still going strong, taking part in major CTFs as part of the bigger organizers team, one of the top team on CTFtime.