Actually security is one of the major things built into the protocol. Few other nice things, but long story short, it'll be a while before IPv6 gets large enough to require adding it. That and the entire subject is beating the dead horse for the hundredth time. It'll get added sometime in the future, I am sure. But, frankly v6 is so rare as is, that short of a few limited tunnels nobody has it yet. Run a search, and drop the subject.
