$ gpg -d crypt.txt.asc¶
gpg: RSA鍵, ID 8CB4361E11E562DAで暗号化されました
gpg: 復号に失敗しました: 秘密鍵がありません
$ gpg --delete-key enshu@joho.org
gpg (GnuPG) 2.2.27; Copyright (C) 2021 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.


pub  rsa3072/C8AB88914291D047 2021-05-22 Enshu Sennyo <enshu@joho.org>

この鍵を鍵リングから削除しますか? (y/N) y¶
$ gpg --list-keys¶
/home/1234567890/.gnupg/pubring.kbx
-----------------------------------
pub   rsa3072 2021-05-23 [SC] [有効期限: 2023-05-23]
      18C1862993692737A590D14C03B868E2AD4A6AA5
uid           [  究極  ] Yamaguchi at ECCS <1234567890@g.ecc.u-tokyo.ac.jp>
sub   rsa3072 2021-05-23 [E] [有効期限: 2023-05-23]

$