I'm surprised they didn't mention Trevor Perrin and Moxie Marlinspike's TACK[1] and Convergence[2]. These are probably the two most promising solutions to the CA-centralized-trust dilemma.
Coming from nature, i expected to read alternatives to certificate-based security.
Are these commentaries actually getting published in the print version of Nature, or is Nature now venturing out in a HBR fashion in the "expert" blogging business?
I believe that this short piece appears in the 'Comments' section in the print edition of Nature.