GnuPG
code:初めて起動したとき
takashi316@penguin:~$ gpg
gpg: keybox '/home/takashi316/.gnupg/pubring.kbx' created
gpg: WARNING: no command supplied. Trying to guess what you mean ...
gpg: Go ahead and type your message ...
hello
gpg: no valid OpenPGP data found.
gpg: processing message failed: Unknown system error