So you want to register to CTP, eh?
The "Cracking the Perimeter" Online course is not an introductory security course. Many pre-requisites are required, such as good familiarity with a Ollydbg, and a general mastery of offensive network security techniques.
This is a two stage registration Challenge:
Stage 1: You must bypass the registration form by inserting the correct Security String.
Stage 2: Once you have the security string, you will need to go through an additional step in order to extract your final Code and Registration key, which will be used in the CTP registration form on the offsec website
Use of automated scanners will result in a 3 minute block from the website. No exploitation or vulnerability scanning is required to bypass the form. Use the source Luke!