"The cryptographic features have not yet been reviewed by those well-versed in the secrecy business and responsible for determining the acceptability of the proposed generalized secrecy arrangements. The analyses made on secrecy have been limited to information found in the open literature (plus a little common sense). (ODC-IX)" source: http://www.rand.org/pubs/resea... and ODC-IX: http://www.rand.org/pubs/resea...

djb’s commentary on IPv6 remains valid today: http://cr.yp.to/djbdns/ipv6mes...