Re: Question of the day: iTunes + Watermarking?

["Dave Korn" <dave.korn () artimi com>]

On 11 July 2006 02:12, Anton Chuvakin wrote:

> > I followed the exact same procedure, on my PowerBook and a co-
> > worker's Mac Mini, and received identical results.  I don't know why
> > the resulting hash is different from yours.  Each computer downloaded
>
> So, what does this prove: watermarking or decompressing of the lossy
> compression? I am not entirely sure why decompressing something which
> was produced with lossy compression would decompress differently
> thought... I would assume that if Ryan repeats his steps again he
> would get the samew md5....

  It would be an interesting experiment to break both the files up into a few
hundred medium-sized chunks and compare the md5s of the chunks.  All we know
so far is that we have two identically-sized binaries with different md5s.  It
could be as simple as a timestamp in a file header that's the only difference
between them.

  Otherwise, I suspect it's time to start comparing FFTs.

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....

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