[p2p-hackers] Error correcting codes toprevent failurein BitTorrent like systems?

[Enzo Michelangeli]

----- Original Message ----- 
From: "Arnaud Legout" <Arnaud.Legout at sophia.inria.fr>
Sent: Tuesday, December 06, 2005 5:46 PM

> You do not target the same problem. It is far more easy to define
> your redundancy parameters to
>  correct x% of corruption than to solve a distributed piece
> selection problem.
> Moreover, corrupted pieces cannot be replicated in a torrent because
> your have a hash for each piece.
> Therefore, I do not see how you can stop at 99% of the download
> because some pieces are corrupted. In this case,
> the piece is simply retransmitted, which increases slightly the
> download time. By no way it should compromise a torrent
> or create a last pieces problem.

Why should retransmission solve the problem? If I'm behind a "mangling
router", trying to download a file a piece of which has a 4-byte sequence
that is mistaken by the router as an IP address that needs translation,
every time I get that sequence the data will be corrupted.

Enzo