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Adds fcsc 2025 and scale 22x

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furtest
2025-06-27 15:28:31 +02:00
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content/writeups/2025/fcsc/hardware/badd_circuit/index.md Normal file
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date = '2025-04-27T14:23:22+02:00'
draft = false
title = 'Badd Circuit (intro)'
tags = [ 'hardware' ]
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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}.
![Circuit picture](./baddcircuit.png)
Two options here either rebuild the circuit in a digital simulator like the great [digital](https://github.com/hneemann/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.