----- Forwarded message from Paul Campbell <[EMAIL PROTECTED]> -----

From: Paul Campbell <[EMAIL PROTECTED]>
Date: Fri, 10 Dec 2004 09:29:27 -0800
To: [EMAIL PROTECTED]
Subject: Re: [p2p-hackers] Re: Memory and reputation calculation
User-Agent: Mutt/1.5.6i
Reply-To: "Peer-to-peer development." <[EMAIL PROTECTED]>

With regards to the history function, I recall seeing a paper (no idea where
or what the title was) that looked at it a different way.

The concern is that in a P2P environment, there's no central assumed
tamper-proof central server. One must rely on the peers themselves for
history.

It would be relatively easy for a peer to simply erase and ignore bad
history, or for peers to be able to collude to report false history, unless
one of two things happens:

1. The vector/group concept of Advogato among others prevents collusion simply
because there are no multple paths...the false history shows up as a
self-referential structure and not as a web of trust links. The group/vector
concept searches for multiple disjoint paths of trust, which lessens or
destroys collusion.

2. That the history passed on by a peer should be serialized in such a way
that it is tamper-proof. That is, the client can't selectively delete events
from the history. For instance, a one-way accumulator-type function intertwined
into the data performs the protection. It doesn't circumvent the possibility
of a client simply deleting the last few events in the history (and nothing
is going to stop a client from doing a snapshot to achieve this), but it at
least makes such selective editting an all-or-nothing function.

_______________________________________________
p2p-hackers mailing list
[EMAIL PROTECTED]
http://zgp.org/mailman/listinfo/p2p-hackers
_______________________________________________
Here is a web page listing P2P Conferences:
http://www.neurogrid.net/twiki/bin/view/Main/PeerToPeerConferences

----- End forwarded message -----
-- 
Eugen* Leitl <a href="http://leitl.org";>leitl</a>
______________________________________________________________
ICBM: 48.07078, 11.61144            http://www.leitl.org
8B29F6BE: 099D 78BA 2FD3 B014 B08A  7779 75B0 2443 8B29 F6BE
http://moleculardevices.org         http://nanomachines.net

Attachment: pgp4p6bphGChR.pgp
Description: PGP signature

Reply via email to