I was cleaning out my office this afternoon and stumbled across the issue of IEEE Computer that included Peter Gutmann’s article on PKI (Public Key Infrastructure).
Stimulated (Praise Google!), I found his home page and his kind posting (PDF) of an even more comprehensive version of that article online. For anyone interested in better understanding PKI, Gutmann’s article is a must read. His “godzilla crypto tutorial” is also an very useful piece of work.