It was a Friday of last May. A client pulled me from the air conditioner to meet him. His department took over the website’s company from another team. His company is service provider and the website is a portal that is serving over 1 million customers natonalwide. Through the portal, user can view their spend . And he needs the support from us to penetrate the security matters of the portal: finding the security weakness, showoff the data leakage if any and suggest the solution.