PicoCTF_2017: Tutorial 3

Category: Tutorial Points: 0 Description:

Robin handed me some color codes the other day. They don't look like anything to me though. Can you help me find her favorite shade of red?

Hint:

Once again, there are tools on the interwebz that can help! (There's a clear theme here, from the easiest pico problems, to the hardest ones in other CTFs, search engines are your friend!)

Write-up

Unfortunately, making an automated tool would be more troublesome. We can use deductive guessing here though, since we know colour codes are RGB. Therefore, we are looking for a value there's greater in the first two hexadecimal digits than the rest.

7A3B00
6000C7
67C700
42FFFC
C70002 <- this seems like the most likely candidate, and it's red too!
0003C7
007A78

Therefore, the flag is, C70002.

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