Checking for new version of a program

[Andrew Dalke]

>What would be a good place to read about signatures and such?

http://razor.bindview.com/publish/papers/os-patch.html

is one place to start.  Here's another

http://www.cryptnet.net/fdp/crypto/strong_distro.html

Warning: I've only skimmed these documents, not read them
enough to see if they really make sense.

                    Andrew
                    dalke at dalkescientific.com