[cap-talk] Mapping multiple untrusted third party to a virtual TTP?

[Rob Meijer]

I was having an interesting discussion on TTPs a few days back that raised
an interesting question about TTPs. I thought that with the high knowledge
on this list with  related issues, someone here might be able to answer
this question.

The concept was that given that you :

1) Have a protocol that needs a TTP
2) Don't have a real TTP
3) Have some number 'n' of 'Untrusted' third parties.
4) Know that at most a number 'm' of these 'n' are in fact both
   'Untrustworthy' AND 'Cooperating' and coordinating with the
   untrustworthy peer.


Would there from this be any way to implement a 'virtual' TTP from the
combination of n untrusted third parties, and if so how low would 'm' need
to be for any given value of 'n' ?

Rob