Takayuki Miyoshi

<p>Really Simple CAPTCHA does not work alone and is intended to work with other plugins. It is originally created for <a href="https://contactform7.com/" rel="nofollow ugc">Contact Form 7</a>, however, you can use it with your own plugin.</p>
<p>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.</p>
<h4>How does it work?</h4>
<p>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.</p>
<p>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.</p>
<p>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.</p>
<h4>How to use with your plugin</h4>
<p>Note: Below are instructions for plugin developers.</p>
<p>First, create an instance of ReallySimpleCaptcha class:</p>
<pre><code>$captcha_instance = new ReallySimpleCaptcha();
</code></pre>
<p>You can change the instance variables as you wish.</p>
<pre><code>// Change the background color of CAPTCHA image to black
$captcha_instance->bg = array( 0, 0, 0 );
</code></pre>
<p>See really-simple-captcha.php if you are interested in other variables.</p>
<p>Generate a random word for CAPTCHA.</p>
<pre><code>$word = $captcha_instance->generate_random_word();
</code></pre>
<p>Generate an image file and a corresponding text file in the temporary directory.</p>
<pre><code>$prefix = wp_rand();
$captcha_instance->generate_image( $prefix, $word );
</code></pre>
<p>Then, show the image and get an answer from respondent.</p>
<p>Check the correctness of the answer.</p>
<pre><code>$correct = $captcha_instance->check( $prefix, $the_answer_from_respondent );
</code></pre>
<p>If the $correct is true, go ahead. Otherwise, block the respondent — as it would appear not to be human.</p>
<p>And last, remove the temporary image and text files, as they are no longer in use.</p>
<pre><code>$captcha_instance->remove( $prefix );
</code></pre>
<p>That’s all.</p>
<p>If you wish to see a live sample of this, you can try <a href="https://contactform7.com/captcha/" rel="nofollow ugc">Contact Form 7</a>.</p>


Really Simple CAPTCHA

Needed this for an installation with custom forms. I used the plugin developers instructions and was able to make a fully custom implementation based on server side validation within 30 minutes. No more spam bots misusing the forms. Thank you!

Great work - easy to implement

Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.

Mark Maunder

WFMattR

wfryan

wfmatt

<h3>WORDFENCE LOGIN SECURITY</h3>
<p>Wordfence Login Security contains a subset of the functionality found in the full Wordfence plugin: Two-factor Authentication, XML-RPC Protection and Login Page CAPTCHA.</p>
<p>Are you looking for comprehensive WordPress Security? <a href="https://wordpress.org/plugins/wordfence/" rel="ugc">Check out the full Wordfence plugin</a>.</p>
<h4>TWO-FACTOR AUTHENTICATION</h4>
<ul>
<li>Two-factor authentication (2FA), one of the most secure forms of remote system authentication available.</li>
<li>Use any TOTP-based authenticator app or service like Google Authenticator, Authy, 1Password or FreeOTP.</li>
<li>Enable 2FA for any WordPress user role.</li>
<li>Completely free to use, no limits or restrictions of any kind.</li>
</ul>
<h4>LOGIN PAGE CAPTCHA</h4>
<ul>
<li>Easily enable Google ReCAPTCHA v3 on your login and registration pages.</li>
<li>Stops bots from logging in without inconveniencing your site visitors.</li>
<li>Robust protection against password guessing and credential stuffing attacks distributed across large IP pools</li>
</ul>
<h4>XML-RPC PROTECTION</h4>
<ul>
<li>XML-RPC is the biggest target for WordPress attacks, but is often overlooked.</li>
<li>Protect XML-RPC with 2FA or disable it altogether if it’s not needed.</li>
</ul>


Wordfence Login Security

The Plugin works and integrates nicely into wordfence security and wp itself. TOTP works great, and the captcha integration works too. Sadly it doesn't support multiple 2fa methods like TOTP & "backup codes" as well as email as backup. Other 2fa methods like U2F are not supported. This Plugin doesn't work with the yubico yubikey hardware keys. 

Good, but somewhat limited

Good compliment to Wordfence, but please add login URL obfuscation!

Because you do not do this either I take another plugin as well like WPS Hide Login, or I just take WP Cerber which does everything!

Great, but...

Easy to use


Does not include the ability to limit login attempts, add password complexity requirements, or anything that would comprise modern security best practices. It's strictly a 2FA plugin, which is done more simply and better by other plugins. It does work tho.


Too much load for a simple 2FA plugin

Secure your website with Wordfence Login Security, providing two-factor authentication, login and registration CAPTCHA, and XML-RPC protection.

Really Simple CAPTCHA vs Wordfence Login Security