Unable to establish a secure connection to iTunes/iPhone

"Could not establish a secure connection to the device."

Here's what you have to do. You need a backup of your old Mac prior to upgrading, or prior to wiping and reinstalling.

You need to open Console on your new mac, and see the error message when you plug your phone into itunes and get that error, this will show up in your console:

8/13/12 1:21:04.537 PM iTunes[491]: AMDeviceValidatePairing (thread 0x11c313000): Could not load pairing record /var/db/lockdown//<device id>.plist

Then you need to go to your time machine backup and navigate to that same folder, and find the missing file. Copy that file back to your new machine into the /var/db/lockdown and you will magically be able to access your device again.