Shell: exiftool, wget, cut, base64

find-hidden-key-cat-jpg.sh

#!/bin/zsh
# Get `cat.jpg` file and find the kidden key
#
# have only been able to get this to work inside the same directory where
# `exiftool` was installed
# in other words, both the `cat.jpg` file and this script must be
# stored in the `exiftool` directory for this to work
#
# get the `cat.jpg` file from picoctf.net
sudo wget https://mercury.picoctf.net/static/7cf6a33f90deeeac5c73407a1bdc99b6/cat.jpg
#
# grep the `License` key line
# cut the base64 hash from that grepped line
# pipe that base64 hash to `base64 -d` for the solution
METADATA="$(echo $(./exiftool cat.jpg | grep License) | cut -d' ' -f 3 | base64 -d)"
# print picoCTF key to terminal
echo $METADATA