dsarrio/dojo-ddr-decrypt repository overview

⁠Dance Dance Revolution Decrypt Challenge

First of all, this dojo has been built around a programming challenge published by newbiecontest.org⁠. All credits goes towards his creator, thanks to them.

⁠Introduction

Passwords have been encoded using a specific procedure, you don't know anything about it and nothing about the passwords themselves. But you managed to enter the system and get your hands on many files encoded using the same procedure. Could you revert it and get back the passwords ?

⁠Javascript starter

Javascript script starter can be used to quickly start investigating. It is a simple nodejs project providing gd bindings and lodash. All you have to do is install NodeJS and run npm install.

⁠Docker

If you do not want to install nodejs and required dependencies, you can use docker also.

> cd js-starter/
js-starter> ./docker-start.sh
/opt # node index.js
/opt # exit

An helpful command to run the script on each file change: while inotifywait -qe modify index.js; do node index.js; done

⁠Mac OSX

If running directly with node on mac you will need to install gd first

brew update
brew install pkg-config gd
npm install

⁠Verifying your solutions

You can use the provided script validate.sh to do it for you by running the script and giving as parameters the file number and the password you've found.

> ./validate.sh 042 thepasswordifound
Nope, try again :)

Also, the solution.txt file is available, it contains for all the input files their corresponding passwords hashed using md5.