01

01 - QR means quick reactions, right?

Description

Level: Easy
Author: Deaths Pirate

Santa's brother Father Musk just bought out a new decoration factory. He sacked all the developers and tried making his own QR code generator but something seems off with it. Can you try and see what he's done wrong?

Solution

We are given a gif that cycles through multiple QR codes. We simply extract the frames by running:

convert -coalesce hackvent2022_01.gif out%05d.png

And then we scan all the images:

zbarimg out*

which outputs

QR-Code:H
QR-Code:V
QR-Code:2
QR-Code:2
QR-Code:{
QR-Code:I
QR-Code:_
QR-Code:C
QR-Code:a
QR-Code:N
QR-Code:_
QR-Code:H
QR-Code:a
QR-Code:Z
QR-Code:_
QR-Code:A
QR-Code:l
QR-Code:_
QR-Code:T
QR-Code:3
QR-Code:h
QR-Code:_
QR-Code:Q
QR-Code:R
QR-Code:s
QR-Code:_
QR-Code:P
QR-Code:l
QR-Code:z
QR-Code:}

which we can concat to get the flag HV22{I_CaN_HaZ_Al_T3h_QRs_Plz}.