gpg --full-generate-key
gpg --export --armor email@email > key.asc
gpg --import pub.asc
gpg --list-public-keys
# or -e -r
gpg --encrypt --recipient friend@email file
echo message | gpg --encrypt --recipient email@email | base64 -w0
# or -c
gpg --symmetric file
echo message | gpg --symmetric | base64 -w0
# or -d
gpg --decrypt file.gpg > file