ECSC 2019 - qrcode
13 May 2019
description: QR Codes everywhere!
category: misc - 102
The challenge is giving us a command to interact with the service:
nc challenges.ecsc-teamfrance.fr 3001.
Okay, we have to make a sum, let’s see the base64:
There is 64 qrcodes and represent an encoded number.
So we have to retrieve the image, cut it in 64 squares decode each qrcode and sums them.
I found a cool lib on github and this is the python implementation to resolve the challenge:
And the output:
Then the flag is