Reverse engineering CRC?

Gregory Ewing greg.ewing at
Mon Mar 15 11:29:51 CET 2010

I've solved the problem now.

It turned out to be a very standard CRC algorithm, complicated
by the presence of a few extra bytes of data being checked that
didn't appear explicitly in the file anywhere.

In the process I developed some very general techniques for
solving this kind of problem, which I've written about here
if anyone's interested:

Thanks for everyone's help,

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