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Security Systems

Simple IP Address Format Checker

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There are more extensive ways to do an IP address format check, but this is a good cursory check. Simply call it passing an IP address as a string and it will return true if it's valid, false if it isn't.

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Validate credit card numbers

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An easy example on how to validate credit card numbers using a small and handy PHP script.

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Hotlink Protection with PHP

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Hotlinking is when another website links directly to one or more of your images or multimedia files and includes it on their web page. Not only is this theft of your intellectual property, but further more, you are paying for the bandwidth used by that site. Which can result in a problem with your budget.

The most common way to prevent others from hotlinking your content is Apache's mod_rewrite. While this a solution that free available to use, there are a couple drawbacks. One being, that Apache has to be configured to use mod_rewrite (--enable-rewrite). Another one being, that for a lot of people writing regular expressions is not the most easiest thing to do.

Of course there are commercial solutions to the problem. Probably the most common one is cPanel. An administration interface for webserver, which let's you create all the necessary items for your hotlink protection with a matter of clicks, in a matter of seconds.

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Math Captcha image validation

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With all the Captcha decoders these days, its impossible to build a solid Captcha image validator with a string. The solution? Have a captcha that asks simple math addition questions! Decoders are not very good at breaking these. This tutorial will show you how to make a basic math CAPTCHA validtion form. This requires that you have the GD library for PHP installed to work.

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Silentum PasswordGen

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Silentum PasswordGen is an excellent password generator tool if you need passwords for email clients, message boards, IM programs, or any other protected pages. It has various options, including choosing whether to use lowercase/uppercase letters, numbers, and symbols, in any combination you desire. Its character limits extend between 5 and 50, and you can generate 1 to 5 passwords at a time. You can use this for your own personal use, or place it on your site to allow visitors to generate their

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PHP CAPTCHA Tutorial

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Captcha stands for "Completely Automated Public Turing test to tell Computers and Humans Apart" and is used for telling humans and computers apart. Here is a tutorial that will teach you how to create your own PHP CAPTCHA.

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Minimal Sanitation Techniques

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This tutorial will show you sanitation techiques used by the pros so that your scripts will be secure, and resistant to any attacks

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