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.

palicao

This plugin adds a new permalink tag %hashed_id% which represents the encrypted 
version of your post ID. 
Uses hashids library (see http://www.hashids.org/php/).
With this plugin you can change your permalink structure into something like
<pre><code>/%hashed_id%/ 
</code></pre>
to obtain links like
<pre><code>http://www.example.com/B7j1rPk8
</code></pre>
or into something like
<pre><code>/%year%/%monthnum%/%hashed_id%/
</code></pre>
to obtain URLs like
<pre><code>http://www.example.com/2012/10/B7j1rPk8
</code></pre>
or
<pre><code>/%hashed_id%/%postname%/
</code></pre>
to obtain
<pre><code>http://www.example.com/B7j1rPk8/my-slug
</code></pre>
This plugin is useful when you want to obfuscate the number of posts or simply 
if you want an unusual and concise url schema. This is also useful if you want to have 
short URLs without using a third-party service.

WP Hashed IDs

This plugin adds a new permalink tag %hashed_id% which represents the encrypted

WP jCryption Security vs WP Hashed IDs