Hi everybody,
there is a project at GitHub,
uncovering the protocol structure of Skype.
Currently only UDP is documented (there is also
a TCP component somehow).
https://github.com/matthiasbock/OpenSkype/wiki/Skype's-UDP-Format
Documentation is not completed, but quite far
and dissecting (and decrypting) pcap captures
using Python on the console already works.
The "next step" would be to implement a Wireshark
dissector for "SkypeUDP".
I have no idea, how to do this ...
Anybody here who would like to help me? ;-)
Cheers, Matthias