$ ls¶
himitsu.txt
$ cat himitsu.txt¶
This file contains a secret.
$ gpg -r 1234567890@g.ecc.u-tokyo.ac.jp -ea himitsu.txt¶
$ ls¶
himitsu.txt	himitsu.txt.asc
$ cat himitsu.txt.asc¶
-----BEGIN PGP MESSAGE-----

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LPzjC89r25gwZh5QsK8LctNbehY=
=Qw17
-----END PGP MESSAGE-----
$