Welcome to SIGFLAG

SIGFLAG is a CTF team based in Linz, organised by motivated students of JKU Linz.

We regularly participate in Attack-Defense security competitions.



Mailing List

If you would like to receive updates about our meetups, upcoming CTF events (1-2 mails per semester), and internal training and workshop sessions (irregularly) you should subscribe to the announcement mailing list sigflag-announce@jku.at.


Subscribe to sigflag-announce


Train your hacking skills

We will host the second edition of our IT Security Workshop in the winter semester 2020/21. Subscribe to our mailing list to stay informed about upcoming workshops.


Become a Hacker

For other inqueries, please contact info ~ at ~ sigflag.at