A good place to start with any consideration of a website’s data security is first, what’s at stake? What would be the consequnces of a security breach? Next, you should consider what specific threats you need to secure against.
There isn’t any such thing as perfect security, it’s always a tradeoff, so knowing why you’re securing your data and from what is going to help you determine what measures are prudent.
Generally speaking, you will want to address the security of your site in general first. Take a look at this article, should be helpful in understanding what you can do:
Hardening WordPress
The Participants Database plugin has undergone several security audits and there are no known exposures in the plugin itself.
Hey! Thanks for your response and for additional info. But still the question remains, is there a way to encrypt a database used by this plugin? Thanks!
It’s possible of you have the coding skills, the plugin has filters that will allow you to encrypt/decrypt the data if that is how you want to secure the data.
This is untested, however, and it will slow things down and possibly cause other problems.