Re: Potential DoS on Bittorrent
From: Joseph Ashwood (ashwood_at_msn.com)
Date: 08/30/05
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- In reply to: Andrew Swallow: "Re: Potential DoS on Bittorrent"
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Date: Mon, 29 Aug 2005 22:13:41 GMT
"Andrew Swallow" <am.swallow@btopenworld.com> wrote in message
news:det4cm$7jj$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...
> Joseph Ashwood wrote:
>> Now, why was sci.crypt added to this? Was it just so you could get me to
>> reply? If you had asked the same question on the BitTorrent discussion
>> list you would've gotten answers that are equally qualified.
> As a guess, sci.crypt was added because if large
> organisations like the BBC and the Hollywood studios
> use Bittorrent to download programmes then they will
> want to encrypt the file. They can then charge you
> for the key variable needed by your player to
> decrypt the file. The key variable can be
> personalised by encrypting it using the subscribers
> public key.
Actually we had a discussion about this on sci.crypt a while ago. Basically,
as they stand now no p2p architectures can support secure DRM (although some
group DRM designs might work, haven't looked to closely). To support good
DRM that doesn't require only the leaking of a single key requires an
architecture change. The methods that came to mind before and still come to
mind now are transferring the first block in a client-server architecture so
the first block can be modified in any number of different ways, and having
k*n blocks where only n blocks are needed, this allows different blocks to
have different keys and gives a lot of room to roam to find something
secure. I can cover either of them in more detail, but I doubt the inner
workings would be all that interesting to most of the people reading.
Joe
- Previous message: Paul Rubin: "Re: The importance of IVs"
- In reply to: Andrew Swallow: "Re: Potential DoS on Bittorrent"
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