Anti spam software Atomic Clock AutoText Bios BIOS Boot CD I BIOS Boot Logo BIOS Boot USB Stick BIOS EPA Logos BIOS Passwords BIOS Update instruction Blog Bios Boot Logo Complete example Feedback HTML Cryptor PC Professionalist wanted ! Mainboard manufacturer PiX Color Picker Programs Ratzeburg
Spam Protection with Captchas
Most of all webmasters, which have contact forms, registration forms or online polls on their websites, know the problem: in a short time they are receiving spam. The reason is, that spammers are using so-called harvesters (also known as webcrawler, spider, robot, or bot). This is a special software, which is searching automatically through the WWW, analyzes websites and tries to fill out any discovered forms with spam.
With Captchas (Completely Automated Public Turing test to tell Computers and Humans Apart), a method, which is able to distinguish between a computer (bot) and a human, it is possible to prevent these spam in most cases.
Examples and Downloads: (PHP, inclusive source code)
Captcha (CSS) - Spam protection with CSS captcha
Captcha (Graphic) - Spam protection with graphic captcha
Captcha (Text) - Spam protection with text captcha
Captchamania - New captcha technologies
Complete example - Graphic-Captcha to protect a form against spam