移除公鑰

1. 列出目前的公私鑰，其中有一筆 key id 907CE30E 公鑰。

   [deyu1@kvm8 ~]$ gpg --list-keys
   /root/.gnupg/pubring.gpg
   ------------------------
   pub   2048R/01D10468 2014-06-05
   uid                  abc123 (abc123) <abc123@csie.cyut.edu.tw>
   sub   2048R/192D59C1 2014-06-05
   
   pub   2048R/907CE30E 2013-06-20
   uid                  De-Yu Wang (rhcx) <dywang7@gamil.com>
   sub   2048R/26F7F452 2013-06-20
   

2. 刪除 key id 907CE30E 公鑰。

   [deyu1@kvm8 ~]$ gpg --delete-keys 907CE30E
   gpg (GnuPG) 2.0.14; Copyright (C) 2009 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  2048R/907CE30E 2013-06-20 De-Yu Wang (rhcx) <dywang7@gamil.com>
   
   Delete this key from the keyring? (y/N) y
   

3. 再列出目前的公私鑰，key id 907CE30E 公鑰已不見。

   [deyu1@kvm8 ~]$ gpg --list-keys
   /root/.gnupg/pubring.gpg
   ------------------------
   pub   2048R/01D10468 2014-06-05
   uid                  abc123 (abc123) <abc123@csie.cyut.edu.tw>
   sub   2048R/192D59C1 2014-06-05