DefCamp CTF Qualification 2017 - HEX Warm Up

Problem

A friend of mine is learning about encryption and now is challenging me to break it! Can you give it a go? Download

Solution

Unzipping returns a python script and an iso file.

The quick and dirty way to solve this task involves running binwalk on the iso file. This returns a text file containing the flag.

$ binwalk -e lock.iso

FLAG: DCTF{474dac08d29d013515a312d1a8460050634f9b3cb6a696a4c73652d1802a1872}