pkaroukin

<p>This plugin will integrate jQuery plugin Hashcash.IO (https://github.com/hashcash/jquery.hashcash.io) to be used in combination with https://hashcash.io/ service.</p>
<p>Active development happens in GitHub repository – https://github.com/hashcash/wordpress-hashcash</p>
<p>Please report all issues at https://github.com/hashcash/wordpress-hashcash/issues</p>
<p>Because of the way plugins work, problem might arrise from specific combination of WP version, plugins, themes.<br />
Therefore for the best result everytime you submit a bug report or just seeking an advice please include following:</p>
<ul>
<li>Version of WordPress you are using</li>
<li>Brand and version of Browser you are using to test it</li>
<li>List of third-party plugins and their versions activated on your website</li>
<li>What theme and version you are using</li>
</ul>
<h3>Protect Against Web Spam</h3>
<p>Typically various “Internet SEO Companies” try to leverage poor forum software protection against mass submission and create many worthless posts with links to a website they are promoting.</p>
<p>Some forum and blog software implement various CAPTCHA solutions but these have two negative aspects:</p>
<ul>
<li>They annoy your visitors.</li>
<li>They provide a fake sense of security.</li>
<li>Today it is possible to buy access to API which solves any kind of CAPTCHA for just $0.70 per 1000 CAPTCHA images solved by a real human being. And do you really think your customer will be happy to try to solve one of these ridiculous CAPTCHAs?</li>
</ul>
<h3>Secure Against Brute Force Attacks</h3>
<p>Many modern applications are susceptible to brute force attacks. Take a typical login form, for example. Hackers can compromise account security by trying every possible password combination. They can also leverage a large network of proxy servers to paralelize this attack. Forcing their browser to work hard makes it too expensive and slow for hackers to perform a brute force attack.</p>
<h3>Based On Open Technologies</h3>
<p>We leverage the following features:</p>
<ul>
<li>Asm.js</li>
<li>HTML5</li>
<li>Web Workers</li>
</ul>
<p>Browsers supported:</p>
<ul>
<li>Google Chrome 28+</li>
<li>Mozilla Firefox 22+</li>
<li>Internet Explorer 10+</li>
<li>Opera 18+</li>
</ul>
<h3>Fully translatable</h3>
<p>All strings are available for translation</p>
<h3>Fully accessible</h3>
<p>We follow both common sense and accessibility guidelines to make this<br />
widget accessible to people with limited abilities. We make it focusable<br />
and actionable via Tab-Enter keys, as well as we have WAI-ARIA live region<br />
which updates blind user via screen reader about progress.</p>


Hashcash

Integrates Hashcash.IO proof-of-work widget with login/registration/comment forms.

Abdussamad Abdurrazzaq

<p>This plugin marries the plugins WP Hashcash and Contact Form 7 thus allowing you to protect your contact forms using captcha-less hashcash spam prevention. Requires both <a href="https://wordpress.org/extend/plugins/wp-hashcash/" rel="ugc">WP Hashcash</a>, or <a href="https://wordpress.org/plugins/wp-hashcash-extended/" rel="ugc">WP Hashcash Extended</a> if you prefer, and <a href="https://wordpress.org/extend/plugins/contact-form-7/" rel="ugc">Contact Form 7</a> to be installed and activated.</p>
<p>The main advantage of using this plugin is that bots who attempt to send spam using your contact form will be blocked without inconveniencing human users. Users won’t have to enter weird image captchas just to reach you.</p>
<p>See the <a href="http://abdussamad.com/archives/581-Captcha-less-Hashcash-spam-protection-for-Contact-Form-7.html" rel="nofollow ugc">Hashcash for Contact Form 7</a> homepage for more information.</p>


Hashcash for Contact Form 7

Add Hashcash spam protection to Contact Form 7.

Hashcash vs Hashcash for Contact Form 7