IPv6 is hardly coming from the ground (you can do point to point encryption with that), good luck to get this implemented world wide scale. Also, your idea seems to generate a huge amount of overhead, which makes things slow. Nice idea, though.
I can do
end to end encryption with IPv6? How do I verify the person at the other end?
The overhead isn't as great as I thought it was, IPv6 addresses are 128 bits, an MD5 hash is the same size, and a SHA1 hash is 160 bits. Routers do not need to know anything about the encryption, they are only looking at the packet header, the same things that they look at in the IPv4 and 6 packet.