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Generating SSH keys 生成 SSH 密钥
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===========
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*跳过本指南。直接下载我们的原生[ windows 应用程序](https://windows.github.com/)*
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SSH 密钥通常用来验证计算机，而无需提供密码。本文说明了如何生成 SSH 密钥 并把它添加到你的 Github 账号。
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*提示：我们建议您定期审查您的 [SSH 密钥列表](https://help.github.com/articles/keeping-your-ssh-keys-and-application-access-tokens-safe)和撤销那些没有被使用的。*
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##Step 1: Check for SSH keys 检查 SSH 密钥
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首先，我们需要检查您的计算机中现有的 SSH 密钥。打开你的 Git Bash 和输入：
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$ ls -al ~/.ssh
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# Lists the files in your .ssh directory, if they exist
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下列为已经存在的文本：
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* id_dsa.pub
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* id_ecdsa.pub
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* id_ed25519.pub
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* id_rsa.pub
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##Step 2: Generate a new SSH key 生成新的 SSH 密钥
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生成一个新的SSH密钥，复制并粘贴下面的文本，确保替代你的电邮地址。默认设置是首选的，所以当你提示“Enter a file in which to save the key”，按回车继续。
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$ ssh-keygen -t rsa -C "your_email@example.com"
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# Creates a new ssh key, using the provided email as a label
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Generating public/private rsa key pair.
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Enter file in which to save the key (/c/Users/you/.ssh/id_rsa): [Press enter]
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接下来，输入密码
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*提示：我们强烈推荐使用一个很好的，安全的密码。更多信息，见 [SSH 密钥的口令工作](https://help.github.com/articles/working-with-ssh-key-passphrases)。*
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Enter passphrase (empty for no passphrase): [Type a passphrase]
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Enter same passphrase again: [Type passphrase again]
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显示如下：
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Your identification has been saved in /c/Users/you/.ssh/id_rsa.
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Your public key has been saved in /c/Users/you/.ssh/id_rsa.pub.
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The key fingerprint is:
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01:0f:f4:3b:ca:85:d6:17:a1:7d:f0:68:9d:f0:a2:db your_email@example.com
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添加你的新的密钥到 ssh-agent（ssh 代理）
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# start the ssh-agent in the background
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$ ssh-agent -s
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Agent pid 59566
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$ ssh-add ~/.ssh/id_rsa
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##Step 3: Add your SSH key to GitHub 添加 SSH 密钥到 Github
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运行下面命令，拷贝 密钥 到 剪贴板，记住 密钥 名称可能是 id_dsa.pub, id_ecdsa.pub 或 id_ed25519.pub.
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$ clip < ~/.ssh/id_rsa.pub
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# Copies the contents of the id_rsa.pub file to your clipboard
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另外，使用您最喜爱的文本编辑器，你可以手动打开公共密钥文件和复制文件的内容。
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现在，你有钥匙的拷贝，是时候添加到GitHub：
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1. 点击右上角设置按钮;
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2. 点击 **SSH keys** 
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3. 点击 **Add SSH key** 
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4. 填入 密钥的描述
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5. 填入 密钥。
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6. 点击 **Add key** 
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7. 确认密码
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##Step 4: Test everything out 测试
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打开 Git Bash 输入:
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$ ssh -T git@github.com
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# Attempts to ssh to github
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看到如下警告
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The authenticity of host 'github.com (207.97.227.239)' can't be established.
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RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
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Are you sure you want to continue connecting (yes/no)?
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输入 “yes”
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Hi username! You've successfully authenticated, but GitHub does not
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provide shell access.
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如果 username 是你的用户名，说明你已经成功了。
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如果收到”access denied（拒绝访问）“的信息。 [阅读这些问题诊断说明](https://help.github.com/articles/error-permission-denied-publickey)。
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如果你从 HTTPS 转到了 SSH ，需要更新你的 远程库的 URL。请参阅[转换远程URL](https://help.github.com/articles/changing-a-remote-s-url)
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*参考*：[https://help.github.com/articles/generating-ssh-keys/](https://help.github.com/articles/generating-ssh-keys/)
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