まずは現在の鍵の情報を確認。
$ gpg --list-key XXXXXXXX pub 4096R/XXXXXXXX 2012-02-10 uid AYANOKOUZI, Ryuunosuke <i38w7i3@yahoo.co.jp> uid AYANOKOUZI, Ryuunosuke sub 4096R/YYYYYYYY 2012-02-10
この鍵からユーザID(uid)を削除。途中でこの鍵のパスフレーズを聞かれる。
$ gpg --edit-key XXXXXXXX
gpg (GnuPG) 1.4.10; Copyright (C) 2008 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.
Secret key is available.
pub 4096R/XXXXXXXX created: 2012-02-10 expires: never usage: SC
trust: ultimate validity: ultimate
sub 4096R/YYYYYYYY created: 2012-02-10 expires: never usage: E
[ultimate] (1). AYANOKOUZI, Ryuunosuke <i38w7i3@yahoo.co.jp>
[ultimate] (2) AYANOKOUZI, Ryuunosuke
gpg> uid 1
pub 4096R/XXXXXXXX created: 2012-02-10 expires: never usage: SC
trust: ultimate validity: ultimate
sub 4096R/YYYYYYYY created: 2012-02-10 expires: never usage: E
[ultimate] (1)* AYANOKOUZI, Ryuunosuke <i38w7i3@yahoo.co.jp>
[ultimate] (2) AYANOKOUZI, Ryuunosuke
gpg> deluid
Really remove this user ID? (y/N) y
pub 4096R/XXXXXXXX created: 2012-02-10 expires: never usage: SC
trust: ultimate validity: ultimate
sub 4096R/YYYYYYYY created: 2012-02-10 expires: never usage: E
[ultimate] (1) AYANOKOUZI, Ryuunosuke
gpg> quit
Save changes? (y/N) y
最後に変更内容の確認。追加されていることがわかる。
$ gpg --list-key 740166A8 pub 4096R/XXXXXXXX 2012-02-10 uid AYANOKOUZI, Ryuunosuke sub 4096R/YYYYYYYY 2012-02-10