furtest
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+++ date = '2025-04-27T14:23:22+02:00' draft = false title = 'Badd Circuit (intro)' tags = [ 'hardware' ] +++
Title: Badd Circuit (intro)
Points: 25
Number of solves: 512
Description:
Here is a logic circuit that implements an unknown function. What is the value of the four output bits?
The flag format is FCSC{<value>}. For example, if the value to find is 0001, the flag would be FCSC{0001}.
Two options here either rebuild the circuit in a digital simulator like the great digital (the name is not that great but the software is). Or do it by hand wich is much faster.
So I just wrote down what the ouput of each gate is (sometime you can skip some) and got the flag.
I forgot to write it down and am too lazy to do it again so let's say that I leave it as an exercice for the reader.