andreyk

The plugin increases security of a site in case it has no SSL certificate, 
useful for owners of small sites who want to secure their passwords and 
other posted data but don’t want to buy SSL certificate for each domain 
and subdomain: it protects from sniffering the most important data such as 
passwords when they are being sent from forms of your site to the server.
When the form served by the plugin is submitted all input data are being 
joined into a string, then this string is being encrypted with AES algorythm 
by disposable key and only encrypred string will be sent.
A browser encrypts the disposable key in javascript by the RSA public key 
and sends it to the server; then the server decrypts it with the RSA private 
key and then use it to decrypt the posted data with AES.
Translations included: Ukrainian, Russian, German and Brazilian Portuguese.
I just adapted usage in WordPress the jCryption jQuery plugin, v. 3.1.0. 
Please check www.jcryption.org to learn how jCryption works.

WP jCryption Security

Prevents forms data against sniffing network traffic through encryption provided by jCryption javascript library.

wp2pgpmail

With wp2pgpmail, your visitors can send you a PGP encrypted message very easily. A contact form will offer encryption for sending you confidental messages.
Don’t have any PGP key? <a href="https://wp2pgpmail.com/pgp-key-generator/" rel="nofollow ugc">Try our online PGP key generator</a>
Get more features with <a href="https://wp2pgpmail.com" rel="nofollow ugc">Gravity Forms PGP Encryption plugin</a>
If you are using <a href="http://bit.ly/GravityFormsWordPress" rel="nofollow ugc">Gravity Forms</a>, you can use the Pro version: <a href="https://wp2pgpmail.com" rel="nofollow ugc">Gravity Forms PGP Encryption plugin</a>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/BAi66orTOUs?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
It’s working with <a href="http://bit.ly/GravityFormsWordPress" rel="nofollow ugc">Gravity Forms</a>, the best full featured contact form plugin for WordPress.
With the paid version, you will get:
<ul>
<li>Additional Fields</li>
<li>Unlimited Forms</li>
<li>Nested Drag n’ Drop</li>
<li>Advanced Email Configuration</li>
</ul>
Check it at <a href="https://wp2pgpmail.com" rel="nofollow ugc">https://wp2pgpmail.com</a>. We are still working on the Free version.
How does it work ?
wp2pgpmail includes an OpenPGP Message Encryption System in Javascript, based on <a href="http://www.haneWIN.de" rel="nofollow ugc">Herbert Hanewinkel’s work</a>. Visitors enter a message in a form, encrypt it (with the PGP public key you entered in wp2pgpmail option settings), then an e-mail is sent to you (blog admin e-mail address). The message is encrypted locally on the visitor’s computer, so no data is transfered in clear !
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/nnY2xirKXkQ?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Is it secure ?
<ul>
<li>All code is implememented in readable Javascript.</li>
<li>You can verify the source code.</li>
<li>No binaries are loaded from a server or used embedded.</li>
<li>No hidden transfer of plain text.</li>
</ul>
Supported languages :
<ul>
<li>English</li>
<li>French</li>
<li>German</li>
<li>Spanish</li>
<li>Estonian</li>
<li>Greek</li>
<li>Indonesian</li>
</ul>

A simple PGP Mail Form Plugin. Enter your PGP public key, then visitors will be able to send you PGP encrypted messages by mail from a form.

WP jCryption Security vs wp2pgpmail