[vorbis] as if you haven't seen this yet

[David Balazic]

Oddsock (oddsock at oddsock.org) wrote :

> At 03:34 AM 7/18/2001, you wrote:
> >On 2001-07-17, The nameless One <oddsock at oddsock.org> wrote:
> > > in case anyone is interested, I have built a win32 program which will
> > > perform a double blind listening tests..It will allow you to play each
> > > sample and allow you to rank them in order of quality. The program
> > > will then send the results to a centralized server which saves it off
> > > to a DB and gives immediate feedback to the user the outcome of the
> > > test.
> >
> >Hm, is it really a double-blind test? I.e. does the program itself know
> >which format it's playing? This could be a problem if somebody wants to
> >abuse this system by writing a client which rates, say, wma best 20
> >million times in a row.
> 
> yes, it truely is a double blind test..since the samples are all WAVs it
> truely does not know what it's playing...not until the results are sent to
> the server, does the server respond back with which sample cooresponded to
> which format.

And then the tester computes the cksums of the WAVs and publishes them ...

You can prevent this by not disclosing the WAV identities until the end of
of the test.

Of course people can analyze the WAVs and discover the used codecs that way.

This is IMHO a stupid way to test anything.

" ... have people ... evaluate ..."

People are stupid an clueless , remember ?

> and by not allowing multiple results submitted by the same IP (on the
> server), you pretty much prevent abuse....although you also probably piss
> off those behind ISP-wide proxies....ah well, you can't please everyone...

People^W Security experts have discovered decades ago that host/IP based
security is no security at all( rsh/rcp/rlogin ). No need to repeat their mistakes.
 
> >Unluckily, I can't think of a solution which does not involve security
> >by obscurity right now. Maybe you can. Or you already have (-:
> >
> >regards,
> >--
> >Andreas Fuchs, <asf at acm.org>, asf at jabber.at, antifuchs


-- 
David Balazic
--------------
"Be excellent to each other." - Bill & Ted
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