Re: Breaking Huffman Codes

From: Mok-Kong Shen (mok-kong.shen_at_t-online.de)
Date: 05/30/03 

Date: Fri, 30 May 2003 17:12:34 +0200

bill@nedell.com wrote:
>
> > What are you doing with that data? Are you trying to analyze an
> > actual plane crash? Do you have the box in your possession, or just
> > the data?
>
> We provide quality assurance data analysis services for airline
> customers.
>
> I don't have routine access to flight data recorder hardware. I do
> have samples of compressed and decompressed files and I've written a
> decoder to experiment with. So far no luck.

I believe you would have quite a hard time. Is it sure
at all that Huffman compression and not some other
compression scheme is involved? It could conceivable
also be the case that one part is simply coded with a
certain code book look-up, while the other part is
compressed with some well-known compression method.
If you have the appartus to experiment with, you
could generate an appropriate input data set and see
how the output changes with tiny modifications of
the input in order to eventually with some luck get
some clues of the transformation that is done by the
manufacturer, but there isnÄt likely to be a systematic
method that leads to success.

M. K. Shen

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