What's really sad to me is that SPKI (RFCs 2692 & 2693) addressed centralisation, complexity and cost, and was more-or-less completely ignored. If the browser

What's really sad to me is that SPKI (RFCs 2692 & 2693) addressed centralisation, complexity and cost, and was more-or-less completely ignored. If the browser and server vendors had just supported it, I really think that it could have had a chance. It was even backwards-compatible with X.509!