Spinners and compression functions

[Perry E. Metzger]

[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