PHP Tutorials — Security

Because internet is the biggest network in the world and everyone can be able to have access to your web site so, You as a web developer can fall in the hall of SQL Injection.. So that I will let you know how to prevent it.

This guide will help you clean your computer of malware. If you think your computer is infected with a virus or some other malicious software, you may want to use this guide. It contains instructions that, if done correctly and in order, will remove most malware infections on a Windows operating system. It highlights the tools and resources that are necessary to clean your system.

With the recent string of high profile break-ins (hacks) at Sony and other companies, it’s time you took a second look at the security of your website. Two-factor authentication is a step in the right direction to securing your website from attackers. In this tutorial, we’ll take a look at implementing this in our CodeIgniter application.

In this in depth “screencast of the week,” I’ll take you through the process of building an authentication system with CodeIgniter. Need to restrict access to certain parts of your website to only those who’ve logged in? This tutorial will teach you how!

From time to time, servers and databases are stolen or compromised. With this in mind, it is important to ensure that some crucial user data, such as passwords, can not be recovered. Today, we are going to learn the basics behind hashing and what it takes to protect passwords in your web applications.

In this article I will explain how to create a PHP Class that will encrypt and decrypt any data with a given password. It is object programmed and uses existing PHP algorithms.

Using PHP to create a CAPTCHA based on simple math.

sometimes we need to generate a random key for verification cases like when we want to email verification when user register at a site and alot of cases

This tutorial shows you how to create a secure user registration / administration area. This simple tutorials explains line by line, with a live demo and full code, of how to do this.

How to create a Captcha in PHP using GD Library, tutorial plus source available