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setting up ssh key-based authentication on ubuntu server: a comprehensive guide

ssh (secure shell) key-based authentication is a more secure alternative to password-based authentication for accessing your ubuntu server. it eliminates the need to repeatedly type passwords and mitigates the risk of brute-force attacks. this tutorial provides a detailed, step-by-step guide to setting up ssh key-based authentication, including generating a key pair, transferring the public key to the server, disabling password authentication, and best practices for security.

**prerequisites:**

* an ubuntu server (or any linux server with ssh) that you have ssh access to.
* a client machine (your computer) with an ssh client installed (openssh is common on linux, macos, and available for windows).

**outline:**

1. **generating an ssh key pair on your client machine**
2. **copying the public key to the ubuntu server**
3. **testing the ssh key-based login**
4. **disabling password authentication (important!)**
5. **securing the ssh key (best practices)**
6. **optional configurations: custom key names, ssh agent, port changes**
7. **troubleshooting**

**1. generating an ssh key pair on your client machine**

this step creates a private key, which you keep secret and secure on your client machine, and a public key, which you transfer to the server.

* **open a terminal or command prompt on your client machine.**

* **use the `ssh-keygen` command to generate the key pair.**



let's break down this command:

* `ssh-keygen`: the command-line tool for generating ssh keys.
* `-t rsa`: specifies the type of key to generate. rsa is a widely used and secure algorithm. you can also use `ed25519` which is a newer and often preferred algorithm: `ssh-keygen -t ed25519 -c "[email protected]"`
* `-b 4096`: specifies the key length in bits. `4096` is a strong and recommended size for rsa keys. for `ed25519`, the `-b` option is not needed as the key si ...

#SSH #UbuntuServer #KeyBasedAuthentication

SSH key authentication
Ubuntu server
setup SSH keys
secure shell
public key authentication
private key
SSH configuration
Linux server security
SSH key generation
authorized_keys file
terminal commands
remote server access
SSH best practices
key pair management
Ubuntu security settings