Re: Pseudonyms and Reputations

[greg@ideath.goldenbear.com (Greg Broiles)]

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Hal Finney writes:

> The simple blinded signature model provides a pretty simple way to allow
> only one pseudonym per True Name in a given forum, if you assume there is
> some way to distinguish people in the real world.  Suppose Cypherwonks
> wanted only one person per nym.  And suppose there was an agency which
> was able to distinguish people, that is, it could tell when it had seen the
> same person twice.  Now, Cypherwonks asks this agency to give a single
> blinded signature of a type (exponent) which is unique to that list, to
> anyone who wants it, but such that nobody gets more than one.

> To be accepted on the Cypherwonks list, then, somebody would have to show
> a signature of this particular type, different from everyone else's.  Each
> person could only get one such token, which Chaum has called an is-a-person
> credential (again, this is a simplification of his idea, I think).

Real-world application of this protocol still depends on folks not
using the credentials of friends/family/dead people, especially where
"real name" <-> credential mapping isn't available.


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