WordPress.org

1. Upload the login-dongle directory to your wp-content/plugins directory.
2. Click on Activate from the Plugins menu.
3. Configure.

Configuration

1. Edit your site settings (from the Settings/Login Dongle menu), choose a message for intruders, and save.
2. Edit your profile (from the Users/Your Profile menu), choose both challenge and response, check the flag Send on next update, and save.
3. Drag-and-drop your new bookmarklet into the bookmarks bar of your browser.

Upgrading from any version prior to 1.3.0

Before version 1.3.0, Login Dongle was site-wide available, and all users essentially shared the same bookmarklet as their login dongle. Starting from version 1.3.0, any user has her own login dongle. Upgrading from previous versions to 1.3.0 is done by automatically associating to each user a login dongle with the same challenge >> response as the one that was already site-wide set.

This makes it possible to upgrade hassle free, even if your blog had other users. Anyway, if that is not what you want, you can configure the login dongle of each user from the Users/All Users menu.