Spinners and compression functions
Perry E. Metzger
perry at piermont.com
Sun Apr 7 20:54:03 PDT 1996
[I've sent a fuller reply to Jon in private mail.]
JonWienke at aol.com writes:
> >Actually, it doesn't. The entropy present from a reasonable source
> >like keyclick timings is much much lower than the output of pkzip is
> >going to suggest to you.
>
> I am not saying that the output of the compression function has 8 bits of
> entropy per byte, but rather that it will have a more consistent entropy
> level per byte than the input to the function.
What makes you think that? There is little to no cause to expect this
at all. I can think of a number of instances, like image data streams,
where this idea is completely unfounded for most conventional
compression techniques.
Perry
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