How to modify ssh in git

Git is currently the most frequently used code version management tool by programmers, and SSH is one of the key authentication methods for pushing and pulling Git code. However, sometimes we need to modify ssh, in this article, I will provide you with some simple methods on how to modify ssh and explain the basics of Git authentication process.

Git Authentication Process

Before understanding how to modify SSH, let us first understand how Git authenticates your identity. The bottom layer of Git uses Secure Shell (SSH) for security authentication. SSH provides an encrypted communication protocol that protects privacy, integrity, and verifiability during data transmission. In the Git authentication process, SSH will use public key encryption technology to implement authentication. The simple process is as follows:

1. Local Git runs ssh-keygen to generate a public key and a private key.
2. Add the public key to the SSH Key tab of the repository in your Git account.
3. Use SSH to authenticate when pulling code from the repository or committing code. If the public key can If it matches the private key, the authentication is successful.

(Note: If you use the HTTPS protocol for Git communication, this process does not involve SSH authentication. Instead, use the username and password of your Git account directly. )

Now let’s take a look at how to modify SSH.

Methods to modify SSH

There are usually two methods to modify SSH: one is to edit the SSH configuration file directly, and the other is to configure it by running the SSH command through Git Bash. Let’s look at them one by one.

First method: Modify SSH by editing the SSH configuration file

1. Use a text editor to open the SSH configuration file. Windows users are usually in the C:\Users\username.ssh directory , or in the ~/.ssh directory for Linux or Mac users.

2. If you have not configured SSH, the ssh folder will not exist, the easiest way is to create an SSH key in Git Bash. Enter in Git Bash:

   ssh-keygen -t rsa -C "your email address"

3. Add the public key to the "SSH password" on your Git account page "Key" tab, you can open your account, select settings and then select SSH Keys, and copy the generated id_rsa.pub to the SSH Key.

4. Edit the config file. If the file does not exist, you can create a new file. Since this is not an introduction to the basics of SSH, we will simply cover the method of adding a new host to the config file in order to override the default settings with the new configuration.

   Host github.com
   HostName github.com
   User git
   IdentityFile ~/.ssh/id_rsa_github

In this configuration file, We defined the name of a new host called github.com, the host name is github.com, and the user name is git. The IdentityFile option specifies the location of the new private key file.

Second method: run SSH command through Git Bash to configure SSH

1. Start Git Bash.
2. Run the ssh-keygen command. It will prompt you for a new file name and path, or you can use the default settings.
3. Add the generated public key to your Git account, visit GitHub or other Git hosting service and log in.
4. Test whether the new key works. Enter ssh -T git@host, where host is the host name you want to test. If everything is fine, you'll see a welcome message telling you that you're connected to your Git hosting service.

The above are two simple methods to perform Git authentication by modifying SSH.

Conclusion

SSH is the key to Git security authentication and a necessary condition for Git to work. Whether you're new to Git or a Git veteran, knowing how to modify ssh is essential. I hope the above method will be helpful to you, go and try it!

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