Tell me more ×  I want something like this, but in a digital
sense:  You and others walk into a room. Everyone knows who each
of you are and everyone is doing their best to figure out what
piece of paper each person is taking. Fortunately the all the
paper is in a box. You bring your own envelope, shuffle the
papers blindly and put one in your envelope, then walk out.
Since no one can see the inside of your envelope you're fine.
The problem is the box.  If a website generates a thousand GUIDs
and has to give you one of them, but isn't allowed to know who
you are, how would it be done? The website must know you are
eligible for a GUID, but how does it give you something to prove
you may have a GUID and not know which you take?  I know you can
sign something blindly, but can you take something blindly?
share|improve this question The sender shuffles the data and you
take a random piece with –  Ricky Demer May 6 '12 at 17:53 add
comment  1 Answer  As Ricky Demer points out, you can take
something blindly. It i