Original article by Maurizio Antonelli
In the previous article we presented some basic concepts of encryption and made some examples of symmetrical and asymmetrical keys, we concluded by saying that a good way to get a certificate with an asymmetric key is GnuPG.
GnuPG is open-source and multiplatform. It uses native command line in a shell or from MS-DOS prompt.
There are also graphical interface:
Enigmail it’s an extension for Mozilla thunderbird. And contains a graphical tool for keys management.