From: jim@bilbo.suite.com (Jim Miller)
Date: Fri, 31 Dec 93 15:03:38 PST
To: cypherpunks@toad.com
Subject: Re: Anonymous Video on Demand
Message-ID: <9312312259.AA25911@bilbo.suite.com>
MIME-Version: 1.0
Content-Type: text/plain



Mike Ingle writes:

>Are you thinking of physical videotape or electronic distribution?

Electronic distribution.


"Anonymous video on demand" is a bit misleading, because I'm not so much  
interested in preventing the video provider from knowing my identity, just  
from correlating my identity with my video selections.


>For electronic distribution, suppose you have a fiber-optic cable with
>n channels, where n is a large number.

My feeling is that this architecture is too inflexible.


Here's the sort of thing I have in mind:

Customer browses the video supplier's catalog and notes the catalog number  
of the video it wants

Customer randomly chooses 99 other catalog numbers to generate a pool of  
100 catalog numbers.

The Customer and the Video Provider engage in a protocol so that the  
Customer ends up receiving 100 compressed and encrypted videos, only one  
of which the Customer can successfully decrypt (and uncompress).

The Video Provider never learns which of the 100 videos the Customer  
successfully decrypts, but is sure that the Customer can decrypt only one
of them.


I don't know what the protocol would be, but it sounds like an ANDOS-like  
protocol.


By the way, I think that if the "rental" fee is low enough, the Video  
Provider wont have to worry about cheaters.  If it costs you more money  
(or time) to cheat the Video Provider than it does to simply pay the fee,  
then most people will pay the fee.  I'm thinking the fee would be as small  
as 25 cents/video, for example.


Jim_Miller@suite.com