Security of syncing over wi-fi?

This would be with both on the same network--I've definitely been in situations, where traveling, where I turn on the phone, find some free wifi, check something online, then later have a minute to pull out the laptop--and if they were set to automatic sync, that would potentially be a problem--IF the data is transmitted in the clear in the wifi sync. But I haven't found a definitive answer as to whether the transfer--computer to phone when connected to the same wifi network--is encrypted. This is NOT referring to 3rd party apps that require wifi sync, or to iCloud, but rather to mail message and contact info in address book that need secure handling.

D'Oh, e-mails are synced with the servers.....but contacts and calendar entries also are potentially sensitive info. I want to avoid doing any sync over public networks, but occasionally I find myself without a cable and would be nice if I didn't have to worry too much about it.

It is a question about syncing iPhone and iTunes over wifi: the question is, does the default wifi sync process encrypt the data between phone and iTunes?

If it does, I'm less worried about the possibility of accidentally triggering a sync over a less-than-secure network. If it doesn't, than I shouldn't set up wifi syncing. I can't trust myself to always be aware of whether syncing is on or not.

I am concerned about the security of other things synced besides mail messages, such as calendar entries that contain protected information, or private phone numbers in contacts.