For encryption check out http://phpseclib.sourceforge.net/
"LGPL-licensed pure-PHP implementations of an arbitrary-precision integer arithmetic library, fully PKCS#1 (v2.1) compliant RSA, DES, 3DES, RC4, Rijndael, AES, SSH-1, SSH-2, and SFTP."
Great to have if you're not sure others will have mcrypt or other options installed on their server.

Briefly tested the virtual machine from BigBlueButton It might not be feature complete yet but they seem to be doing great and I'm looking forward to future updates.

I'll take death please... no wait I meant I'll take cake, I want cake...
You said you wanted death!
I really meant cake... ok fine, but we're out of cake.
So my choices OR death?

Then something about chicken right? heh
Eddie Izzard is great.