Rewrite Security Code - Clipshare

I need to rewrite completely the security code for my website that is running with clip-share 3.01. The actual security code is weak and easy to be hacked. I will need a copy of the new code and the instruction to get access to the security code in writing to keep. This is a work for hire and we will own all the rights of this job after is finished, installed and in fully operation in our site. Security EXPERTS only please.