how can PKI/CA ensure that a public key belongs to someone?

@Acer You can't. The idea of having PKI infrastructure wasn't meant to confirm your identity.
Instead it was built on as a "web of trust" where people can vouch if it's really your key.

@deesapoetra

If pki can t vouch it, how can people vouch it via pki?

@Acer well. Here's a good way to look at it.
I publish my public key. And i mentioned it in social media for example.
People would vouch for my key that way.

Or... i can built an internal web of trust when we were actually friends with each other in real life and would vouch each other key.

@deesapoetra

PKI should connect to root central authority.
If you just exchange public keys with friends, you needn't a pki

@Acer yep. Unless you want someone to vouch for it.
Some PKI like ubuntu keyserver provide comments section if i'm not mistaken.

@Acer wait is it comment section or just a section where there's a list of people whk signed your key? I forgot. I never upload my key to a keyserver

@deesapoetra

What is whk?
Is it "Who"?
How can the list vouch for keys

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