Most e-mail messages I send are digitally signed using a process called "Pretty Good Privacy", or PGP. In e-mail applications that don't understand PGP, this digital signature will show up either as an attachment called "PGP.sig" or as a part of the message starting with "BEGIN PGP SIGNATURE" at …

It is the start of a new year ((Some have even said it is the start of a new decade, but of course that isn't true. We won't start a new decade until 2011, just like we didn't actually start a new millennium until 2001.)), and it seems like a …