CTF: MBR - C:\>EDIT CONFIG.SYS
MBR Capture the Flag Challenge
Album released: 04 Sep 2016
https://masterbootrecord.bandcamp.com/album/c-edit-config-sys
Secret
30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 30 30 30 30 20 30 30 31 30 31 31 31 30 20 30 30 31 30 31 31 30 31 20 30 30 31 30 31 31 31 30Analysis
At a glance, I only see 3 different numbers: 20, 30, and 31.
With just 3 bits of data, I’m not sure what this could represent. (Ternary!?)
It’s possible they could be grouped in 2’s or 4’s.
Or perhaps the first digit of each number is irrelevant and it’s obfuscated binary.
Converting to hexadecimal, gives:
00101110 00101101 00100000 00101110 00101101 00101110 00101110 00100000 00101110 00101101 00101110 00101110 00100000 00100000 00100000 00100000 00100000 00101110 00101110 00100000 00100000 00100000 00100000 00100000 00101110 00101110 00101110 00101110 00100000 00101110 00101101 00100000 00101110 00101110 00101110 00101101 00100000 00101110 00100000 00100000 00100000 00100000 00100000 00101110 00101110 00100000 00101110 00101110 00101110 00100000 00100000 00100000 00100000 00100000 00101101 00101101 00100000 00101101 00101110 00101101 00101101 00100000 00100000 00100000 00100000 00100000 00101101 00101110 00101101 00101110 00100000 00101101 00101101 00101101 00100000 00101101 00101101 00100000 00101110 00101101 00101101 00101110 00100000 00101110 00101110 00101101 00100000 00101101 00100000 00101110 00100000 00101110 00101101 00101110
Then converting that back to decimal:
.- .-.. .-.. .. .... .- ...- . .. ... -- -.-- -.-. --- -- .--. ..- - . .-.
Solution
Morse code that reads: ALLIHAVEISMYCOMPUTER.