On NETTUTS.com today there's a new post by Dustin Blake with a few simple tips and helpful techniques to locking down and protecting your website with some simple PHP scripts.

One crucial part of PHP development practice is always keeping in mind that security is not something you can simply buy off the shelf at your local convenient store. Ensuring the security of your web applications is a process, which over time, needs to be constantly evaluated, monitored, and hardened.

He shows a few methods you can use to secure things - generating random values, making random passwords to give to your users, creating salted passwords, obfuscation and an overview of cryptography in PHP. Complete source code is included.