On Wed, Jun 15, 2011 at 5:21 PM, Eran Hammer-Lahav <e...@hueniverse.com>wrote:

> > I suspect another choice of words would be useful there.  Implicit grants
> rely
> > on the browser's authentication of the receiving web site.  When https is
> > used, that authentication is fairly strong.
>
> "authentication of the receiving web site"? Authentication how, and what is
> a receiving web site?
>
> The implicit grant relies on the presence of the user to "vouch" for the
> client by making the connection of how it got to the authorization server
> and what she is being asked to approve. In other words, the user does
> something that lands her in front an authorization page. If that page makes
> sense to her in that flow, she approves access to the party that got her
> there.
>

Security for the implicit grant type comes from identifying the client based
on the redirect URI.  At client registration time, you bind client_id X to
redirect URIs Y and Z.

If the redirect URIs use HTTPs, that gives you reasonable security.
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