However, those key steps are only part of the total security solution for online retailers. All the steps you take to protect to customers and build trust are marginalized if your web host is not doing everything it can to secure your website. Your choice in hosting provider is incredibly important.
Recently, I participated in a webinar with hosting powerhouse Rackspace: Minimizing Risk & Maximizing Customer Trust with an E-commerce Solution. We discussed the financial impact to ecommerce sites if you do not establish trust, the core security infrastructure your web hosting solution must have, and the configuration and service options that you need to consider.
Also, make sure to read all the other helpful free information and resources that Rackspace provides for ecommerce websites. They even have deals on SSL!