> Hi,

> please find attached the user id
> Yu-Chin Tsai ....
> of your key A.... signed by me.

> If you have multiple user ids, I sent the signature for each user id
> separately to that user id's associated email address. You can import
> the signatures by running each through `gpg --import`.

> Note that I did not upload your key to any keyservers. If you want this
> new signature to be available to others, please upload it yourself.
> With GnuPG this can be done using
>     gpg --keyserver pool.sks-keyservers.net --send-key A....

> If you have any questions, don't hesitate to ask.

gpg --import [attached_file]
gpg --keyserver pool.sks-keyservers.net --send-key [ID]

# 安裝 signing-party
apt-get install signing-party

# 準備使用 caff, 第一次會產生config範本
caff

# 編輯 ~/.caffrc
# change the name
$CONFIG{'owner'} = 'Thomas Tsai';
# change the email address
$CONFIG{'email'} = 'bg@aaa..com';
# your keyid
$CONFIG{'keyid'} = [ qw{1234567890ABCDEF} ];

# 加強安全性 所以再編輯 ~/.caff/gnupghome/gpg.conf
personal-digest-preferences SHA512
cert-digest-algo SHA512

# 來 caff 吧
caff 01234567

# sign 好之後要輸入 save, 之後會問你要不要寄出去，寄出去就完成了。

sudo apt-get install graphviz xdot 
gpg --list-sigs  | sig2dot >sig_file.xdot
xdot sig_file.xdot