Authentication Updates for MySQL
MySQL 5.5.7 Adds New Authentication Capabilities
MySQL version 5.5.7 has been released with changes to the authentication process. MySQL authentication now supports new capabilities: pluggable authentication and proxy users. The first, allows the server to use plugins to authenticate incoming client connections, and the second allows users to enable a client to have the privileges of a different user. For more information on these authentication changes, please see the Changes file.