OSPFv3 Authentication and Encryption

Hi,
does this means IPsec is the only way to authenticate in OSPFv3?
I tried with the following and it worked:

R2#interface Ethernet0/0

no ip address

ipv6 address 2001::2/64

ospfv3 1 authentication key-chain CISCO

ospfv3 1 ipv6 area 0



R2#show ospfv3 ipv6

OSPFv3 1 address-family ipv6

Router ID 2.2.2.2

Active Key-chains:

  Key chain CISCO: Send key 1, Algorithm HMAC-SHA-1, Number of interfaces 1

    Area BACKBONE(0)

thanks

Edit: This post gives the idea that OSPFv3 does not support any authentication beside IPsec, but after checking it does support the usual MD5 and HMAC that I mentioned above.
Samer.