Encryption software such as PGP and GPG unfortunately has always been suffering from low adaption rates outside of the computer nerd / hacker crowd. The less than stellar user experience of many of those encryption tools has been a major contributing factor to that. However, those tools have come long way both feature-wise and as for their usability, for instance have a look at the formidable GPGMail / GPGTools for OS X that makes dealing with public key encryption a breeze. Nevertheless, ...
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