Improve physical security of critical systems, especially domain name and root servers.

CNN: Global panel issues Internet security recommendations

The DNSrides on top-level servers around the world, which in turn are guided by the true pillars of the Internet:13 root servers, most of them run by volunteers.

FORBES: The Next Threat

Mr Black said he, and many others, would prefer a slimmed-down Icann that did little more than manage the root servers which contain the net's master address lists.

BBC: Net body under pressure

Mr Black said many domain registries like Nominet felt frustrated by Icann's stance, given that the root servers only held a database of the 300 or so computers with detailed lists of which domain was where.

BBC: Net's servers under scrutiny