In this mini howto I would like to show how to add a required captcha field in the login form, after a defined number of unsuccessfull attempts.
To do this, I will use the blog demo that you have in default Yii download package (path/to/yii/demos/blog).
I installed phpseclib because I needed to do some AES encryption in my project. After all the hassle of installing php lib, I found out that Yii already has a security module (securityManager). I finally decided to keep using phpseclib because it has one big advantage over Yii securityManager module, it does not requite mcrypt to be installed in the phpserver!
This article is called extended guide is because there is already a security guide in the Yii tutorial security section. but that guide is not complete in the sense that it does not rise the developers' attention to some other commonly happening attacks: SQL injection and magic URL, which can be major vulnerabilities in your application without much caring.