Math Comment Spam Plugin asks the visitor making the comment to answer a simple math question. This is intended to prove that the visitor is a human being and not a spam robot.

This plugin does not require JavaScript or cookies. It uses a special encryption function; the result of the question is being passed via a hidden field. The result is being compared with the value entered by the visitor – after encrypring this value as well.

You can download the plugin here.

Technorati Tags: wordpress, plugin, comment, spam, protection, math

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