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?

986B

badaes.zip

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?

875KB

chall.png

image

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.

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

218KB

chall.webp

image

77 teams solved