What you are asking is very general, I'm not sure what would work best for your application. You will have to choose a method that works for you. The best I can do is suggest things that might work, you will have to sort through the details or each option. If you have specific questions about a specific method we should be able to help you out.
Have you searched the forums and read through other discussions on this topic? If so that should give you a start. Below are some threads that might help spark some ideas.
http://www.picbasic.co.uk/forum/sear...d=146892&pp=25
http://www.picbasic.co.uk/forum/show...light=checksum
http://www.picbasic.co.uk/forum/show...light=checksum
http://www.picbasic.co.uk/forum/show...light=checksum
http://www.picbasic.co.uk/forum/show...light=checksum
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