The next Version of µAnytun (0.2svn85) is now available. µAnytun has now support for encrypted and authenticated VPN Connections. The complete sourcecode can be downloaded at the download section.
UPDATE:
I found a bug which prevents the daemon from using the correct cipher key when using a key derivation rate other than 1. Therefore i released a new Version (0.2.1svn91) which is available at the download section.