> For the complete documentation index, see [llms.txt](https://codingmace.gitbook.io/masterward/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://codingmace.gitbook.io/masterward/ctf/2017/sect-2017.md).

# SEC-T CTF

## Bad AES - Crypto \[100 pts] \[Not Solved]

> Acid Burn found this AES-CBC encrypted text in the garbage file that Joey stole from the Gibson. Sadly, Joey didn't get the full S-BOX used by The Plague. Can you help them recover the text?

{% file src="/files/-MdYA2lzNaJ1V2yuNS7v" %}
BadAES
{% endfile %}

## Qproximity- Crypto \[200 pts] \[Not Solved]

> n = 2462649746477364143454082050368305440553491900304388646893610847386194301369924385009730987303651345060031438478297733694036327257723431468649220444397635127530301992505638291521092898714917678389314956983918603221732358628680256253537449204312287724750669208856634711056863315465220853759428826555838536733 \
> e = 201527

Solution Here

## Joeys Screenshot - Misc \[50 pts]

> Joey gave me this screenshot to prove he got into The Gibson. Can you help us hack The Gibson too?

{% file src="/files/-MdYCrRsY1BtyWAyBfhL" %}
screenshot
{% endfile %}

Starting out we use `binwalk -e chall.png` and find that there are a lot of files. They are named with just some letters and looking through them there was a pattern. Noticed there is a letter followed by a number. I wrote some code to rearrange it and put it into an empty array.

```python
import os 

files = os.listdir(".")
print(files)
cx = [] # Character Array
for i in range(0, 50):
	cx.append("-")
for filename in files:
	if "." not in filename:
		print(filename)
		f = open(filename)
		fs = f.readline()
		print(len(fs))
		let = fs[0] # Letter
		place = int(fs[1:]) # Place
		cx[place] = let
ans = ""
for xx in cx:
	ans += xx
print(ans)
```

Flag: SECT{D4\_K3Y\_2\_D4\_G1B50N\_5UP3RU53R\_15\_G0D\_H3H3!}

## Acid Burn - Misc \[200 pts] \[Not Solved]

> I suspect Acid Burn is hiding something in her background image, but I can't quite figure out what is it. Can you help me?\
> Author: SecureLink / klondike

{% file src="/files/-MdYCRrJJcv0d9Cl2zCB" %}
Acid\_burn
{% endfile %}

77 teams solved

## Report - Misc \[200 pts] \[Not Solved]

> Mr. Belford sucks, is he hiding something....\
> Author: d3vnu11

{% file src="/files/-MdYCjF4YVM7fACYC-On" %}
Report
{% endfile %}

48 teams solved