This  extension is now free.

Unless you use SSL, a user logs into Joomla sending his password in plain text across the network. A malicious user could take advantage of this vulnerability and can have access to the back-end.
This plugin is an alternative to SSL. It uses RSA to encrypt passwords or any other data you want in your component.
It is recommended to have the bcmath extension installed, otherwise DES algorithm is used.

Works with Signal Login, JTP Horizontal Login, PWC Login, Inline Login and vtj login modules.

For other Joomla extensions, like Alpha Registration, Community Builder, Core Design Login Module, Yoo Login, YJ Pop Login Module, Virtuemart you can find plugins at http://ratmil.com/encryption-plugins-for-popular-login-modules.html.

Changes in version 1.1.8

- Fixed bug that was preventing users from logging in.

Changes in version 1.1.7

- Fixed for backward compatibility with mySql 4.

Changes in version 1.1.6

- Fixed for backward compatibility with mySql 4 and PHP 4.

- Dutch language added.

Changes in version 1.1.5

- Fixed a bug that came up when bcmath scale parameter was not zero.

Changes in version 1.1.4

- Bug fixed to integrate with Alpha Registration Component.

Changes in version 1.1.3

- Included GPL license text and statements.

Changes in version 1.1.2

- Fixed small issue related password saving.

Changes in version 1.1.1

- Keys are generated automatically every a certain amount of days
- Users can specify how often the keys are generated.
- Fixed a bug related password autocompletion.
- Menu is correctly shown based on current language.