Digital Signatures and Encryption with GPG/PGP

GNU Privacy Guard (GPG) is a free-software drop-in replacement for Symantec's proprietory PGP cryptographic software suite.
It is useful in many ways, from saying "Yes, I really sent that message", to using it to encrypt a message or files for privacy, to something as important as signing a checksum file, after all, what's the point of creating a checksum for a file, since if your machine is compromised, all they need to do is to recreate a new checksum and you're none the wiser, but this is harder to get around when it is also expected to be digitally signed by someone.
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