Really Simple CAPTCHA wordpress plugin resources analysis

Download This Plugin
Download Elegant Themes
Name Really Simple CAPTCHA
Version 1.8.0.1
Author Takayuki Miyoshi
Rating 86
Last updated 2014-12-17 05:22:00
Downloads
3150018
Download Plugins Speed Test plugin for Wordpress

Home page

Delta: 0%

Post page

Delta: 0%
Really Simple CAPTCHA plugin has no negative impact on PageSpeed score.

Home page PageSpeed score has been degraded by 0%, while Post page PageSpeed score has been degraded by 0%

Really Simple CAPTCHA plugin added 3 bytes of resources to the Home page and 15 bytes of resources to the sample Post page.

Really Simple CAPTCHA plugin added 0 new host(s) to the Home page and 0 new host(s) to the sample Post page.

Great! Really Simple CAPTCHA plugin ads no tables to your Wordpress blog database.

Really Simple CAPTCHA does not work alone and is intended to work with other plugins. It is originally created for Contact Form 7, however, you can use it with your own plugin.

Note: This product is "really simple" as its name suggests, i.e., it is not strongly secure. If you need perfect security, you should try other solutions.

How does it work?

Really Simple CAPTCHA does not use PHP "Sessions" for storing states, unlike many other PHP CAPTCHA solutions, but stores them as temporary files. This allows you to embed it into WordPress without worrying about conflicts.

When you generate a CAPTCHA, Really Simple CAPTCHA creates two files for it; one is an image file of CAPTCHA, and the other is a text file which stores the correct answer to the CAPTCHA.

The two files have the same (random) prefix in their file names, for example, "a7hk3ux8p.png" and "a7hk3ux8p.txt." In this case, for example, when the respondent answers "K5GF" as an answer to the "a7hk3ux8p.png" image, then Really Simple CAPTCHA calculates hash of "K5GF" and tests it against the hash stored in the "a7hk3ux8p.txt" file. If the two match, the answer is confirmed as correct.

How to use with your plugin

Note: Below are instructions for plugin developers.

First, create an instance of ReallySimpleCaptcha class:

$captcha_instance = new ReallySimpleCaptcha();

You can change the instance variables as you wish.

// Change the background color of CAPTCHA image to black
$captcha_instance->bg = array( 0, 0, 0 );

See really-simple-captcha.php if you are interested in other variables.

Generate a random word for CAPTCHA.

$word = $captcha_instance->generate_random_word();

Generate an image file and a corresponding text file in the temporary directory.

$prefix = mt_rand();
$captcha_instance->generate_image( $prefix, $word );

Then, show the image and get an answer from respondent.

Check the correctness of the answer.

$correct = $captcha_instance->check( $prefix, $the_answer_from_respondent );

If the $correct is true, go ahead. Otherwise, block the respondent -- as it would appear not to be human.

And last, remove the temporary image and text files, as they are no longer in use.

$captcha_instance->remove( $prefix );

That's all.

If you wish to see a live sample of this, you can try Contact Form 7.

Screenshots

Resources added by plugin to Home page/Post page in kB
Total size of resources for Home page/Post page in kB
Random Theme Tests
Clean Yeti Basic screenshot

Clean Yeti Basic

by: rlafranchi

11056
100%
MyJournal Theme screenshot

MyJournal Theme

by: flamaa

6970
0%