GnuPG如何安全地分发私钥（3）导出私钥

提示：分发私钥，是危险的！

我有好几个电脑，只想用一对密钥；也就是说我须要把个人私钥，放到那几个电脑上。这样，我就就能够在任意电脑上，解密和签名以及其余。

1 怎么作

使用（临时）公钥把私钥加密，而后传到个人其余某个电脑，再解密。

2 个人debian8，生成（临时）密钥

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) <andypeker@163.com>

sub 4096R/0A09DAC9 2016-11-25 [expires: 2017-04-24]

root@debian8:~#

root@debian8:~#

（编辑这个key，而且修改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) <andypeker@163.com>

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:~#

3 个人Centos7，生成（临时）密钥

[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) <andypeker@163.com>

sub 4096R/0A09DAC9 2016-11-25 [expires: 2017-04-24]

[root@centos7 ~]#

[root@centos7 ~]#

（编辑这个key，而且修改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) <andypeker@163.com>

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 ~]#

4 导出2个（临时）公钥给个人（opensuse13）电脑

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 root@192.168.19.147:/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 root@192.168.19.147:/root/

Password:

centos7.pub.key 100% 1662 1.6KB/s 00:00

[root@centos7 ~]#

5 个人（opensuse13）电脑导入2个（临时）公钥

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:~ #

（编辑这二个key，而且修改trust）

opensuse13:~ # gpg -k

/root/.gnupg/pubring.gpg

------------------------

pub 4096R/276856F7 2016-11-25 [expires: 2017-04-24]

uid [ultimate] FranklinYang (Encrypt RSA 4096) <andypeker@163.com>

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:~ #

整个过程的惟一不安全的地方就在这里，经过scp分发2个“临时”公钥；没有涉及认证，也没有签名！其实能够签名一下，或者对比指纹fingerprint，达到认证这2个公钥的效果。

6 个人（opensuse13）导出个人私钥

opensuse13:~ # gpg -K

/root/.gnupg/secring.gpg

------------------------

sec 4096R/276856F7 2016-11-25 [expires: 2017-04-24]

uid FranklinYang (Encrypt RSA 4096) <andypeker@163.com>

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:~ #