David Scribner has written a 2-part guideline on how GNU-PG, a powerful encryption package, can 'play a vital role in personal and business communications by increasing security'. A must have if you are concerned about keeping the data on your PC or in your email confidential.
Links
[1] https://www.pambazuka.org/author/contributor
[2] https://www.pambazuka.org/taxonomy/term/3305
[3] https://www.pambazuka.org/article-issue/82
[4] https://www.pambazuka.org/category/ict-media-security
[5] http://www.pambazuka.org/en/category.php/internet/10327