My challenge was selected for the finals where it was solved by 2 of the 10 teams: Turla Tech Support and ISW, number 1 and 2 on the scoreboard.
Since I received good feedback about my challenge, I decided to put it up for everyone to have a go at it. Below you can find all the information. I will publish the solution soon.
Description
Dear User,
I have created a first version of my authentication framework.
The relevant code can be found at http://pastebin.com/xC28zKUs.
The server can be found at 52.90.142.76 port 9000.
You will find that it is pretty much unhackable, or can you find the secret password?
Regards,
Sean