PicoCTF 2021 Writeups

our team's writeups for the 2021 PicoCTF competition

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PicoCTF2021-Writeup

For the sole purpose of proving people did stuff.
On a side note... these are the writeups for the few questions we managed to complete.
Side note x2: I don't think my team mates are going to add to this anymore but I'm going to also add in the questions that got solved after pico ended and be sad about the simplicity of some of them cough milk. Everything before this commit was solved before pico ended (if it matters)

If you'd like to try some of these problems yourself, head on over to PicoGym!

For all binary exploitation problems in this writeup, you can find a more detailed explanation here

Questions

General Skills
Question Points
Obedient Cat 5
Python Wrangling 10
Wave a flag 10
Nice netcat... 15
Static ain't always noise 20
Tab, Tab, Attack 20
Magikarp Ground Mission 30
Cryptography
Question Points
Mod 26 10
Mind your Ps and Qs 20
New Caesar 60
Dachshund Attacks 80
Pixelated 100
Play Nice 110
It is my Birthday 2 170
New Vignere 300
Web Exploitation
Question Points
Ancient History 10
GET aHEAD 20
Cookies 40
Scavenger Hunt 50
Some Assembly Required 1 70
It is my Birthday 100
Who are you? 100
Most Cookies 150
Forensics
Question Points
information 10
Weird File 20
Matryoshka doll 30
tunn3l v1s10n 40
Wireshark doo dooo do doo... 50
MacroHard WeakEdge 60
Trivial Flag Transfer Protocol 90
Disk, disk, sleuth! 110
Milkslap 120
Disk, disk, sleuth! II 130
Reverse Engineering
Question Points
Transformation 20
keygenme-py 30
crackme-py 30
speeds and feeds 50
Shop 50
Binary Exploitation
Question Points
Stonks 20
What's your input 50