This isn't patent trolling. Apple and Ericsson had a license agreement and when it ended they couldn't agree on a new price and went to court about it. They've now reached a price they both agree to in this settlement.
Yes, it is for one specific handshake, similar to many others. At a quick glance, the claims don't seem to cover any earthshaking innovation, but the introduction claims this makes it resistant to weaknesses in the underlying crypto algorithms that have been shown to be broken.
