打开终端
输入：
ssh-keygen -t rsa -C "xxx@xx.com"
回车,出现如下提示：
Last login: Tue Oct 31 10:20:24 on ttys004
bogon:~ YYKit$ ssh-keygen -t rsa -C "xxx@xxx.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/xx/.ssh/id_rsa):
继续回车，中间会让输入两次密码，什么都不输入，继续回车，会出现如下内容：
Last login: Tue Oct 31 10:20:24 on ttys004
bogon:~ YYKit$ ssh-keygen -t rsa -C "xxxx@xxx.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/xx/.ssh/id_rsa):
/Users/xx/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/xx/.ssh/id_rsa.
Your public key has been saved in /Users/xx/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:rp+6MLo27uTIONMqlO6/E9d9CvJzvVt5QI9I6Z2vy14 468466882@qq.com
The key's randomart image is:
+---[RSA 2048]----+
| |
| . |
| o . |
| o + + |
| . . S o = . |
| o . o + . . + |
|o.. = o o + o E |
|*=+o o + + .o + |
|*XB=o ++= o+=. |
+----[SHA256]-----+
bogon:~ YYKit$
这时候，复制/Users/xxx/.ssh/id_rsa.pub.，然后前往文件夹，
屏幕快照 2017-10-31 上午10.33.30.png
打开id_rsa.pub,复制"xxx@xx.com"之前的部分。
这时候，来到Github，在你的个人账户中，按照顺序依次点击“Settings --> SSH and GPG keys --> SSH keys --> New SSH Key”,Title可以写自己喜欢的标记，在Key下面粘贴之前复制的内容,然后点击Add SSH Key，之后可能会让你输入账户密码进行验证，这就就添加成功了。
