On Fri, Apr 24, 2009 at 5:03 PM, Seth Fitzsimmons <[email protected]> wrote:
> Good point.  Might language on the authorization page explaining where
> the phrase should have come from be the answer (it limits the
> possibilities, but phishers are creative ones)?

Sure

> Pre-generating
> phrases would be tricky, as not all apps have the concept of
> "identity" and may not have the opportunity to generate phrases
> beforehand.

I'd say that if the application has the concept of an identity it
should be a sensible practice to generate it beforehand and educate
its users to recognize it (it would work as an anti-phishing measure).
I can think of three different cases here:

1. consumer has the concept of "identity", and want to protect the
real identity: the phrase would be generated and known to the user
before the OAuth dance (he would have been educated to see the phrase
when authorizing)

2. consumer has the concept of "identity", and sends the requests
presenting the user's identity (at the consumer site): non need to
generate a phrase which would be simply a string representing the
identity itself (maybe the username), the user would know that he has
to see his identity on the authorize screen

3. consumer has not the concept of "identity": the service provider
shows a BIG WARNING about not having received any identity information
from the consumer, and advise the user to check if it has rightfully
started the request.

Luca

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