Automattic, the company behind blogging platform WordPress.com, has announced the immediate availability of 2FA (two-factor authentication) for WordPress.com account holders. Self hosted WordPress blogs can download a plugin at: http://wordpress.org/extend/plugins/duo-wordpress/
Automattic has announced two options.
You can download and use the Google Authenticator software and use it to generate one-time login codes on iOS, Android or BlackBerry devices. Or you can choose to have your login codes delivered to a mobile phone via SMS.