"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."