[troymc]

If packet timing or sizing gives away the protocol, then it seems to me that one could re-rig it to mimic the timing and sizing of another protocol.

[phillco]

Interesting. Has there been any success in disguising encrypted BitTorrent traffic as another protocol? I guess it'd have to be a protocol whose packets contain a large amount of random data and a large number of connections with different foreign addresses. Hmmm.

[xorglorb]

Skype would seem to fit the bill.

[phillco]

That was my best guess too, and Skype is also ubiquitous and would be extremely difficult (popularity wise) to censor. But I doubt video data is truly random -- it probably has some structure to it.

[anthonyb]

Encrypted video/voice data looks like encrypted Bittorrent data.

[phillco]

Oops, forgot Skype video was encrypted. Duh. In that case it'd do fine.