The authenticity of host ‘github.com (20.205.243.166)‘ can‘t be established.

github初始化仓库，无法链接

在github创建一个新的仓库时，如果我们未初始化，官方会提供命令行，如下：

git add <file>...
git commit -m "first commit"
git branch -M main
git remote add origin git@github.com:gitname/example.git
git push -u origin main

如果你按照github官方指令敲打了一遍 bash，却得到无法链接主机的提示：The authenticity of host 'github.com (20.205.243.166)' can't be established.

The authenticity of host 'github.com (20.205.243.166)' can't be established.
ED25519 key fingerprint is SHA256:example
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])?
Host key verification failed.
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

解决无法与主机'github.com(20.205.243.166)'建立真实性

# 问题原因

未与github.com建立链接关系（一般出现在新客户端，或重装系统的客户端）
与github.com建立的关系不匹配（被恶意篡改或其他用户使用替换了）

# 生成密钥

在命令行输入以下命令，youremail@example.com 需要改成你的github邮箱

ssh-keygen -t rsa -C "youremail@example.com"

具体实现，见下输出

PS D:\vinca\www> ssh-keygen -t rsa -C "youremail@example.com"     
Generating public/private rsa key pair.
Enter file in which to save the key (C:\Users\Administrator/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in C:\Users\Administrator/.ssh/id_rsa.
Your public key has been saved in C:\Users\Administrator/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:ue8DrQkgc6SQVl12kx8YvtcODWM8WVzTyd88PW7bcec youremail@example.com
The key's randomart image is:
+---[RSA 2048]----+
| ..=+=o . .oo +. |
|o...B. o o  .= .o|
|.. *. . +     .o.|
|  + *..o.     . .|
|   + = .S.     *o|
|    . + ...   ..+|
|       o.+     .E|
|        o..      |
|         .o.     |
+----[SHA256]-----+
PS D:\vinca\www>

# 物理路径

根据输出提示，已经告诉您。身份信息和公钥放在您电脑的 C:\Users\Administrator/.ssh/

打开 id_rsa.pub，复制里面的内容

# 建立交互

a. 打开github，登录你的邮箱用户

github.com/login

b. 进入个人中心的设置（Settings）选项

c. 创建新的 ssh 密钥

d. 根据提示，输入标识（title)、密钥（key)、密钥类型（key type) 这里的 key type 选择 Authentication key，因为我们刚刚通过命令产生的是身份识别文件 id_rsa

Your identification has been saved in C:\Users\Administrator/.ssh/id_rsa.

e. 确认添加（Add SSH key）后需要你验证一下当前用户密码，以此继续操作。

f. 添加成功后的示例

g. 回到你的编辑器（自带或集成git工具）[示例vscode]，重新执行提交代码命令：

PS D:\vinca\www> git push -u origin main
Enumerating objects: 10, done.
Counting objects: 100% (10/10), done.
Delta compression using up to 8 threads
Compressing objects: 100% (8/8), done.
Writing objects: 100% (10/10), 1.40 KiB | 717.00 KiB/s, done. 
Total 10 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
To github.com:example.git
 * [new branch]      main -> main
branch 'main' set up to track 'origin/main'.

显示提交到main分支成功了。

# 验证

通过以下链接，访问你的github项目仓库，记得gitName改成你的账户名，remoteName改成你的仓库名。

https://github.com/*gitName*/*remoteName*