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.

laceous

Please note that I’ve moved away from WordPress for the time being. I have no plans to continue updating my plugins. If someone was thinking of forking this project, now would be the time.
Semisecure Login Reimagined increases the security of the login process by using a combination of public and secret-key encryption to encrypt the password on the client-side when a user logs in. JavaScript is required to enable encryption. It is most useful for situations where SSL is not available, but the administrator wishes to have some additional security measures in place without sacrificing convenience.
This plugin is a “re-imagining” of the original <a href="https://wordpress.org/extend/plugins/semisecure-login/" title="Semisecure Login" rel="ugc">Semisecure Login</a> (which used one-way MD5 hashing). This version works with the new phpass hashed passwords that WordPress uses, as well as maintaining backwards compatibility with the older (pre WordPress 2.5) MD5 hashed passwords. Theoretically, it will also work with any other hashing algorithm (because this plugin simply adds an extra layer in the process rather than trying to authenticate anything itself).
This plugin requires PHP to be compiled with openssl support, which is a pretty standard option for most hosts.
<h3>Additional Info</h3>
In general…
<ul>
<li>Semisecure Login Reimagined 3.2.x is tested to work with:
<ul>
<li>WP 3.1.x</li>
<li>PHP 4.3.x – 5.3.x</li>
</ul>
</li>
<li>Semisecure Login Reimagined 3.1.x was tested to work with:
<ul>
<li>WP 2.8.x – 3.0.x</li>
<li>PHP 4.3.x – 5.3.x</li>
</ul>
</li>
<li>Semisecure Login Reimagined 3.0.x was tested to work with:
<ul>
<li>WP 2.7.x – 2.9.x</li>
<li>PHP 4.3.x – 5.3.x</li>
</ul>
</li>
<li>Semisecure Login Reimagined 2.x was tested to work with:
<ul>
<li>WP 2.2.x – 2.8.x</li>
<li>PHP 4.2.x – 5.2.x</li>
</ul>
</li>
<li>Semisecure Login Reimagined 1.x was tested to work with:
<ul>
<li>WP 2.1.x – 2.7.x</li>
<li>PHP 4.3.x – 5.2.x</li>
</ul>
</li>
</ul>
** See the readme.txt file for each version for more specific information

Semisecure Login Reimagined

"Re-imagined" version of Semisecure Login that uses public and secret-key encryption to encrypt passwords when logging in.

WP jCryption Security vs Semisecure Login Reimagined