> Think about it this way: you can not live without trusting "central
> You trust your supermarket when you are buying food, you trust your
> car mechanic when you are driving car, you trust your electric company
> when you turn your computer on and so on.
Non Sequitur. Yes, most people's non-farming lifestyles force them to trust a supermarket. But the article was talking about an alternative to generic profit-driven CAs that FORCE you to trust ALL items signed by them. Just because you are forced to trust A supermarket, doesn't mean you are forced to trust ALL supermarkets. It's not an all-or-nothing model like CAs are.
The current way SSH operates is "everyone makes their own decisions on which keys to trust" (both clients and servers). Totally not secure unless you give everyone lots of security training. The web of trust idea allows a company to say to it's employees "you're approved on all our servers" and "you should trust all our servers". That's pretty cool. No tin foil hat required.
> It's neither usable nor feasible to play these "web of trust" games
> in real world
Wrong. The opposite is true: It's not feasible to give EVERYONE the same level of trust.
Would you give a ride to someone on the street? Probably not, but you'd have no problem giving a ride to someone in your Yoga class.
Would you let a stranger into your house? Probably not, but you'd let in someone who is a friend of your mom.
Do you eat food from strangers on the street? No, but you probably eat the free samples at the grocery store (trusting that the grocery store isn't going to poison you).
Ok, only geeks use the term "web of trust", but it still exists in the real world.
> why cyberworld must be any different?
Just because we can't do something in the real world doesn't me we shouldn't do it in the cyberworld. Look at people with 1000's of friends in their social networks: They are much more likely to get a job by posting "I need a job" to their social network (cyberworld) than scanning the newspapers or asking a handful of close friends (real world).