我有好幾個電腦，只想用一對金鑰；也就是說我需要把我的私鑰，放到那幾個電腦上。這樣，我就就可以在任意電腦上，解密和簽名以及其他。
使用（臨時）公鑰把私鑰加密，然後傳到我的其他某個電腦，再解密。
root@debian8:~# gpg -k
root@debian8:~# gpg -k
/root/.gnupg/pubring.gpg
------------------------
pub 4096r/276856f7 2016-11-25 [expires: 2017-04-24]
uid franklinyang (encrypt rsa 4096)
sub 4096r/0a09dac9 2016-11-25 [expires: 2017-04-24]
root@debian8:~#
root@debian8:~#
（編輯這個key，並且修改trust）
root@debian8:~# gpg -k
/root/.gnupg/secring.gpg
------------------------
sec 1024d/d04d1a0b 2016-11-25 [expires: 2016-12-09]
uid debian8
ssb 2048g/c1845da4 2016-11-25
root@debian8:~# gpg -k
/root/.gnupg/pubring.gpg
------------------------
pub 4096r/276856f7 2016-11-25 [expires: 2017-04-24]
uid franklinyang (encrypt rsa 4096)
sub 4096r/0a09dac9 2016-11-25 [expires: 2017-04-24]
pub 1024d/d04d1a0b 2016-11-25 [expires: 2016-12-09]
uid debian8
sub 2048g/c1845da4 2016-11-25 [expires: 2016-12-09]
root@debian8:~#
[root@centos7 ~]# gpg -k
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]# gpg -k
/root/.gnupg/pubring.gpg
------------------------
pub 4096r/276856f7 2016-11-25 [expires: 2017-04-24]
uid franklinyang (encrypt rsa 4096)
sub 4096r/0a09dac9 2016-11-25 [expires: 2017-04-24]
[root@centos7 ~]#
[root@centos7 ~]#
（編輯這個key，並且修改trust）
[root@centos7 ~]# gpg -k
/root/.gnupg/secring.gpg
------------------------
sec 1024d/28d414a1 2016-11-25 [expires: 2016-12-09]
uid centos7
ssb 2048g/cda873f4 2016-11-25
[root@centos7 ~]# gpg -k
/root/.gnupg/pubring.gpg
------------------------
pub 4096r/276856f7 2016-11-25 [expires: 2017-04-24]
uid franklinyang (encrypt rsa 4096)
sub 4096r/0a09dac9 2016-11-25 [expires: 2017-04-24]
pub 1024d/28d414a1 2016-11-25 [expires: 2016-12-09]
uid centos7
sub 2048g/cda873f4 2016-11-25 [expires: 2016-12-09]
[root@centos7 ~]#
root@debian8:~# gpg -a -o debian8.pub.key --export d04d1a0b
root@debian8:~#
root@debian8:~#
root@debian8:~# l debian8.pub.key
-rw-r--r-- 1 root root 1645 nov 25 23:16 debian8.pub.key
root@debian8:~#
root@debian8:~# scp debian8.pub.key [email protected]:/root/
password:
debian8.pub.key 100% 1645 1.6kb/s 00:00
root@debian8:~#
root@debian8:~#
[root@centos7 ~]# gpg -a -o centos7.pub.key --export 28d414a1
[root@centos7 ~]# ls -l centos7.pub.key
-rw-r--r--. 1 root root 1662 nov 25 23:15 centos7.pub.key
[root@centos7 ~]#
[root@centos7 ~]# scp centos7.pub.key [email protected]:/root/
password:
centos7.pub.key 100% 1662 1.6kb/s 00:00
[root@centos7 ~]#
opensuse13:~ # gpg --import debian8.pub.key
gpg: key d04d1a0b: public key "debian8" imported
gpg: total number processed: 1
gpg: imported: 1
opensuse13:~ # gpg --import centos7.pub.key
gpg: key 28d414a1: public key "centos7" imported
gpg: total number processed: 1
gpg: imported: 1
opensuse13:~ #
（編輯這二個key，並且修改trust）
opensuse13:~ # gpg -k
/root/.gnupg/pubring.gpg
------------------------
pub 4096r/276856f7 2016-11-25 [expires: 2017-04-24]
uid [ultimate] franklinyang (encrypt rsa 4096)
sub 4096r/0a09dac9 2016-11-25 [expires: 2017-04-24]
pub 1024d/d04d1a0b 2016-11-25 [expires: 2016-12-09]
uid [unknown] debian8
sub 2048g/c1845da4 2016-11-25 [expires: 2016-12-09]
pub 1024d/28d414a1 2016-11-25 [expires: 2016-12-09]
uid [unknown] centos7
sub 2048g/cda873f4 2016-11-25 [expires: 2016-12-09]
opensuse13:~ #
整個過程的唯一不安全的地方就在這裡，通過scp分發2個「臨時」公鑰；沒有涉及認證，也沒有簽名！其實可以簽名一下，或者對比指紋fingerprint，達到認證這2個公鑰的效果。
opensuse13:~ # gpg -k
/root/.gnupg/secring.gpg
------------------------
sec 4096r/276856f7 2016-11-25 [expires: 2017-04-24]
uid franklinyang (encrypt rsa 4096)
ssb 4096r/0a09dac9 2016-11-25
opensuse13:~ # gpg -a -o franklinyang.rsa.sec.key --export-secret-keys 276856f7
opensuse13:~ # l franklinyang.rsa.sec.key
-rw-r--r-- 1 root root 3132 nov 25 21:19 franklinyang.rsa.sec.key
opensuse13:~ #
或者：opensuse13:~ #
opensuse13:~ # gpg -o franklinyang.sec.key --export-secret-keys franklinyang
opensuse13:~ #
opensuse13:~ #
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