online qualification for the Google Capture The Flag finals ( ctftime.org) ran from 22/06/2019, 00:01 UTC to 23/06/2019 23:59 UTC.
As last year, there were plenty of diversified challenges, which were worked out very well.
I tried to take at least a look at as much challenges as possible and solved the challenge Quantum Key Distribution, which was relatively easy based on the amounts of solves. Within this article I want to share my writeup on this challenge.
The writeup is divided into the following sections:
Continue reading “Google CTF 2019 (Quals) – Quantum Key Distribution”
VolgaCTF 2019 Qualifier ( ctftime.org) took place from 29/03/2019, 15:00 UTC to 31/03/2019 15:00 UTC.
There has been a really interesting RSA
crypto challenge called Blind, which I would like to share with you in this writeup.
The article is divided into the following sections:
Challenge description → What does the script do? → Blind RSA Signature → Retrieving the Flag
Continue reading “VolgaCTF 2019 Qualifier – Blind”
nullcon HackIM 2019 CTF ( ctftime.org) ran from 01/02/2019, 16:30 UTC to 03/02/2019 04:30 UTC.
I did the pwn challenge
babypwn, which was really fun to do. The following article contains my writeup being divided into the following sections:
Challenge description → Security mechanisms and disassembly → Signedness vulnerabilitiy → Format string vulnerabilitiy → Final exploit
Continue reading “nullcon HackIM 2019 – babypwn”
Codegate CTF 2019 Preliminary ( ctftime.org) ran from 26/01/2019, 00:00 UTC to 27/01/2019 00:00 UTC.
Within this article I want to share my quick writeup on the challenge
Continue reading “Codegate CTF 2019 Preliminary – KingMaker”
Meepwn CTF Quals 2018 ( ctftime.org) ran from 13/07/2018, 19:00 UTC to 15/07/2018 19:00 UTC.
There were a lot of interesting-looking challenges. As always, time was the limiting factor 😉 I managed to spend 2 hours on saturday morning solving the pwn challenge
Continue reading “Meepwn CTF Quals 2018 – babysandbox”
qualifications for the Google Capture The Flag 2018 ( ctftime.org) ran from 23/06/2018, 00:00 UTC to 24/06/2018 23:59 UTC.
The CTF was worked out very well. There have been plenty of interesting and creative challenges.
This time I decided to focus on the category
web and managed to solve the challenge JS safe 2.0, which was the easiest one of the web-challenges based on the amount of solves. Nevertheless it really took my some time to dodge all the pitfalls I stumbled upon while solving the challenge.
Continue reading “Google CTF 2018 (Quals) – writeup JS safe 2.0”
RCTF 2018 ( ctftime.org) ran from 19/05/2018, 09:00 UTC to 21/05/2018 08:59 UTC.
I wrote the following writeup for the crypto challenge
Continue reading “RCTF 2018 – writeup cpushop”
angstromCTF 2018 ( ctftime.org) ran from 16/03/2018, 20:00 UTC to 23/03/2018 00:00 UTC.
As the description on
ctftime.org states, the ctf is primarily geared towards high school students but with a very wide range of challenge difficulty.
There have been a lot of interesting challenges which have been fun to do. I decided to make a writeup for the pwn challenge
Continue reading “angstromCTF 2018 – writeup hellcode”
Texas A&M University CTF ( ctftime.org) ran for over one week from 17/02/2018, 00:00 UTC to 26/02/2018 00:00 UTC. There have been a lot of challenges starting at a very easy difficulty.
I did the five pwn challenges ranging from 25 to 200 points:
–> pwn1 (25 pts)
–> pwn2 (50 pts)
–> pwn3 (75 pts)
–> pwn4 (125 pts)
–> pwn5 (200 pts)
Continue reading “TAMUctf 18 – writeup pwn1-5”