Well it's a checksum, because UDP doesn't really have error correcting like TCP does. I think I'm on to something for this pattern, but it might not be it.
On a side note: Have you considered joining J2HG? We are really looking for people like you (with packet\network abilities). We're actually working on a program like this (that can join passworded servers properly), but haven't gotten nearly as much figured out for the passwords as you have. http://link.idlegames.com/j2hg
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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