How to Protect Your Resource from Spam Bots
Spam Bot is one of many different malicious bot types disrupting normal operation of websites. It is meant to collect data, including emails, and place links to spammy sites. Unfortunately, the main result of such malicious actions is the lowering of pages ranking in search engines. That is why no webmaster or site owner could afford to neglect spam bots.
If the comment section is an essential site option that couldn't be disable there are several ways to protect your resource from spam bots and avoid potential damage.
Hidden form fields
To make it more difficult to detect these hidden fields by bots you should constantly rename them by some PHP-functions. Sometimes this method of operation is called “invisible captcha”.
You may have to manually write some code (snippets could be easily found in the web) or implement appropriate plugins using this model of thwarting spam bots. One of them is Honey Pot for WordPress that crafts a hidden fields and rename them regularly making it simple to ban bots or catch them in a spam trap of infinite loop. Another one with similar mechanism is WordPress Antispam Bee plugin.
“I'm not a spammer” check box
To detect a spam-bot and spammer there is a method of invisible check box that engage your visitors without annoying. The user could be offered to confirm his good intentions by visible “I'm not a spammer” check box while an invisible “I'm spammer” check box will be added to the submission form or comment section.
There are various plugins available to help you do so, for example Growmap Anti Spambot (GASP).
Anti-spam verification questions and Invisible Captcha
Still actual defence method is adding to the form some verification questions. Before the user is allowed to complete the registration process, you can introduce to him some custom questions that couldn't be answered correctly by spam-bots.
Briefly about some other ways to trick bots. You could install Invisible Captcha plugin that check if Submit Button was clicked. To submit form, bots would use some program solutions instead press the button as humans.
As hackers continue to exhibit flexibility and to maintain efforts towards the bots improvement, the other world needs to be responsive and confronts the challenges by creating new elegant methods of defence.
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