Capture The Flag Challenges from Cyber Security Base with F-Secure
The Univeristy of Helsinki (Finnland) created an online course on mooc.fi called Cyber Security Base with F-Secure where I participated. Although I don't need it, you get 10 ECTS credits for participating. The course contains five parts and the last part is a CTF (Capture The Flag), which this blog post is about. The CTF gives only one credit ( worth around 27 hours of work ) and I spent a lot more, but I completed all tasks. The CTF itself ( described here ) links to the 20 challenges . Participating requires signup for the course, but maybe the university opens it later for everyone. If not, read the challenges here. For most you don't need anything else than the description. In some cases you need an image (which you also find here) or a link to a program (while available you can still download it). Only the three "bank" challenges require that the site is still available. I'll describe here the individual challenges and how I solved them. For some I receive