本文主要介绍如何使用终端，生成ssh key。 SSH只是一种协议，用于计算机之间的加密登录，存在多种实现，既有商业实现，也有开源实现。本文针对的实现是OpenSSH，它是自由软件，应用非常广泛。

生成SSH KEY：

	$ ssh-keygen -t rsa -C "your_email@example.com" , 

然后会要求你输入公钥的名字：

	Enter file in which to save the key (/Users/LaoTao/.ssh/id_rsa): ssh_rsa

接下来要求输入密码，以及确认密码：

	Enter passphrase (empty for no passphrase): 
	Enter same passphrase again: 

以下是整个终端命令流程：

	$ ssh-keygen -t rsa -C "your_email@example.com"
	Generating public/private rsa key pair.
	Enter file in which to save the key (/Users/LaoTao/.ssh/id_rsa): ssh_rsa
	Enter passphrase (empty for no passphrase): 
	Enter same passphrase again: 
	Your identification has been saved in ssh_rsa.
	Your public key has been saved in ssh_rsa.pub.
	The key fingerprint is:
	SHA256:m4+0RNpNoAgjjpmtIrQhmwvQHsGnOIoikVkJ/tVqHXM your_email@example.com
	The key's randomart image is:
	+---[RSA 2048]----+
	|.                |
	|.o .  .          |
	|..B .. +.E       |
	|o@.*..o.+.       |
	|%+=..o..S .      |
	|*Bo..  + =       |
	|%..   . * .      |
	|*.     o +       |
	|.       o .      |
	+----[SHA256]-----+				

可以使用cat命令查看公钥：

	$ cat ~/.ssh/ssh_rsa.pub 
	ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCuX2Zbre+4kPLkolvWXXtmvehFoO/LYVe+/EDA3j4NLX+6GZYXqAG6IEDAKzDKUzaUoxfuWZFk8ZyHhjfViD3FC90Yh9xuIXGYua4xyy6/7CC/HK2mS3Ha0SGW/QKMJ+QrLyeCpUeNiGDbH12DvUJpgp1vwTIIi0Pkykz6SP2mWkgpAKsBYExg+PkY2aLzopw2GpW0JApqQ9Jz/yMZQ5T7yh/k7iYZNWQ/ch9UxmM58gEQjw1qHiC7QZU9JvJsbh+qusNcIjcKLjMrwhw6q21jeGtn+7It4hKo9YL76OR/QRi1OWUJzqOaTY4ssUBEU15f3OGxVT03emJ556hFyVLn your_email@example.com

拷贝命令：

Windows:

clip < ~/.ssh/id_rsa.pub

Mac:

pbcopy < ~/.ssh/id_rsa.pub

GNU/Linux (requires xclip):

xclip -sel clip < ~/.ssh/id_rsa.pub

然后将复制的ssh_rsa.pub 公钥粘贴到git服务器的SSH配置中。例如github: