Mail and communication security is a basic right of all citizens. Whatever country you live in, you should be assured that no one else has read your letter before it's delivered to you.

The constitutional right of privacy protects all written messages from the prying eyes of others. Similar rules apply to digital communication, although that's recently been put to test by revelations made by the likes of Edward Snowden, which leads us to believe that the intelligence community has little respect for this privacy.

The problem is that email messages pass through the Internet like postcards for everyone to read. To address this issue, in 1991, Phil Zimmermann, a Symantec employee, developed Pretty Good Privacy (PGP), a robust process for encrypting emails.

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