CrySyS Security Challenge 2021

secchallenge crysys CTF pwn crypto web hardware misc reverse
Published on 17 Mar 2021

 

This blogpost contains my writeups for the CrySyS Security Challenge 2021!

Flags are HIDDEN until the end of the semester due to University reasons.

The tables below contain my solution for some of the challenges. I did not managed to solve a lot, but plan on solving some more until they are available. The Solved column indicates the challenges I managed to solve during the challenge period.

Crypto

Challenge Solved
Monoalphabetic MadMax ✅
Stateless ❌
Prerecorded ❌
Variable length mtp ❌
Oracle ❌

Pwn

Challenge Solved
c0pydump ✅
Guidance to Salvation ❌
KUVID21 ❌
Roguelike ❌
Conundrum at El Nit Patroon Rico ❌

Reverse

Challenge Solved
SerialHacker ✅
:) ❌
Xenia Laurencia Maria ❌
Celestial Yarr Harr Harr ❌
JuniorPK ❌

Web

Challenge Solved
SQpLosIon ✅
Manual for the apocalypse ✅
Until the end ✅
Poison for tomorrow ❌
Jinja ninja ❌

Hardware

Challenge Solved
Escape the chains ✅
The gates of Valhalla ✅
A safe place ✅
Crystal from the past ✅
SPIcy information ❌

Misc

Challenge Solved
キーボード・レイアウト ✅
I use arch btw ✅
Little Mix ✅
TBD ✅
Lost & Found ❌

all tags

CTF crypto crysys dnSpy hardware misc pwn reverse secchallenge secchallenge22 web