To the Reader
Did you pick this book up just to figure out how to encrypt a file or validate a download? Then this page is for you; if not, it’s my promise to provide useful information on the first page and every page after that. These tips are for users with Gnu Privacy Guard (GnuPG) already installed--which includes all major Linux distributions1. GnuPG works at the command line, so OS X and Linux users open a terminal window, Windows users open the command line window.
To encrypt a file (example.doc) with a secret passphrase, use this command:
You’ll be prompted for a passphrase, twice (to confirm it) and then a file will be written called ...
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