Eric's Thoughts

I participated in the Hackvent 2017 . This is a nice CTF-like event with a new challenge every day during Advent. It starts easy and gets harder with later challenges. Here's my write-up of the challenges and how I solved them (for those I did). I did not finish all of them, much less on the same day, but at least the easy and medium ones are here. All files that were downloadable are included here as well, with a link to pastebin (base64 encoded and days 18 and 21 additionally zipped). Let me know if you find any mistakes or if you have additional comments. I think I made about 24 points in total, but you needed 60 points minimum for getting a bronze title and 120 points maximum (I think 115 was required for gold or so). One big problem was to solve everything on time. As usual, I learned a few things and I can hopefully learn even more by reading the correct solutions. Maybe this write-up can help you too. Day 1 - 5th anniversary Level: easy Text and hints: Day...

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...