GnuPG
GnuPG is an open source OpenPGP implementation.
Generating keys
The following will prompt for a full name and email address. The resulting key will be stored in the trust DB.
gpg --gen-key
Exporting keys
Public keys can be shared to verify signatures and allow encrypting files for only your consumption:
gpg --output public.key --armor --export some@email
Private keys should be exported only if the key was generated for the purpose of authentication on another system, or for backup:
gpg --output private.key --armor --export-secret-key some@email
Importing keys
Regardless of public/private, it's always just --import:
gpg --import public.key
gpg --import private.key
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