12-shades-of-redpwn

Description

Plain text

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Everyone's favorite guess god Tux just sent me a flag that he somehow encrypted with a color wheel!

I don't even know where to start, the wheel looks more like a clock than a cipher... can you help me crack the code?

Files

• color-wheel.jpg

• ciphertext.jpg “Text” XD

Lets think like a clock, and start numbering colors from 0-11

And if we map the corresponding numbers, we get

Plain text

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86 90 81 87 a3 49 99 43 97 97 41 92 49 7b 41 97 7b 44 92 7b 44 96 98 a5

Now, we know that the flag begins with the prefix flag{, which helps us easily guess what it is, since 'f' and 'l' differ by 4, here the ciphertext also differs by 4 i.e 90-86. Also, 'l' and 'a' differ by 11, which confirms, that it is base 12 encoding.

Voila, here we go

Python

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EXTRACTED = '86 90 81 87 a3 49 99 43 97 97 41 92 49 7b 41 97 7b 44 92 7b 44 96 98 a5'

flag = ''.join([chr(int(i,12)) for i in EXTRACTED.split()])
print(flag)

flag = flag{9u3ss1n9_1s_4n_4rt}