[TazeTSchnitzel]

I'd say Mozilla's Persona delivers it best:

* Mozilla doesn't have any information on you

* Mozilla doesn't store your password if possible, and instead falls back to your email provider (but they do NOT learn which site you logged into)

* It can eventually be decentralised and browser-integrated (though this may have been abandoned)

* The site only knows your email address

I can't remember, but I don't know if Mozilla knows which sites you log into, either.

[kaffee]

Mozilla also has a reputation for being concerned about privacy.

[StavrosK]

> I can't remember, but I don't know if Mozilla knows which sites you log into, either.

I'm fairly certain it does not, and that this was built into the protocol from the start. Please let me know if I'm mistaken.

Persona is a fantastic protocol. Too bad Mozilla seemed too eager to drop support...

[i80and]

It's pretty darn easy to integrate, too; I used it for a toy project, and it was really quite pleasant!

[TazeTSchnitzel]

Yep. I've used it for a few sites because it's simple to implement and saves me the hassle of making my own registration system. Actually, I've used it for every site I've made requiring login, except for one which sadly couldn't use it (targeting the Nintendo 3DS web browser, which is legacy WebKit).

[jamshid]

sadly doesn't seem like Mozilla Persona is a good go-forward project http://identity.mozilla.com/post/78873831485/transitioning-p...

[TazeTSchnitzel]

Well, it's not abandoned, just Mozilla isn't really leading the charge now. If more people adopt it, perhaps they could be convinced to fund development once again.