Input validation or data validation is a technique to test and verify all incoming data to make sure that it is in the right format. All applications should treat user input as untrusted by default and make sure that only the right kind of information is entered.
Personal information is easily retrievable from hard drives even long after they’ve been deleted so it’s essential to understand how to keep storage secure and erase it securely.
Browser cookies are small pieces of information that are stored on the user’s computer while they browse websites.
Client-side SSL certificates are a great tool to add an extra layer of security by validating client connections.
There are a few more different ways to further extend protective measures through Apache, most of them are quite simple to configure.