From: Aahz on
In article <4B9E0C1F.9020003(a)canterbury.ac.nz>,
Gregory Ewing <greg.ewing(a)canterbury.ac.nz> wrote:
>
>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:
>
>http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

Excellent essay!
--
Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer