RE: namedroppers, continued

> Too bad nobody has ever thought of it 
> before; we  could really use the outcome 
> of that research
while researchers has not thought about global
PKI, their are research which focus on spam 
elimination.

this is the work all about (yesterday's seminar in a MIT group)

" If I don't know you, and you want your e-mail to appear in my
  inbox, then you must attach to your message an easily verified
 "proof of computational effort", just for me and just for this
 message.

If the proof of effort requires, say, 10 seconds to compute, then the
economics of sending spam are radically altered, as a single machine
can send only 8,000 messages per day.

The recent proliferation of spam has lead to a renewed interest in
these ideas.  This  work is about both the choice of
functions that can be used to yield easily verifiable proofs of
computational effort, and architectures for implementing the proof of
effort approach.  Filtering and/or forcing senders to pay in other
currencies, such as human attention and money, will be covered as time
permits"


for more details http://research.microsoft.com/research/sv/PennyBlack