SSH Key Authentication Create and Share

Why SSH Keys are Important? SSH keys use asymmetric encryption—a public key is placed on the server, and a private key stays on your device. 
 Benefits over Passwords  
 
 Security: Keys are far more resistant to brute-force attacks than passwords 
 Convenience: No need to type passwords every time 
 Automation: Ideal for scripts and remote tasks 
 Granular Access: You can assign different keys to different users or devices 
 
 Pre requisite- Needs OpenSSH if not already installed. 
 Generating SSH Keys 
 
 On your local computer that will be used to establish connection with a server 
 In terminal type following command 
 
 ssh-keygen -t rsa -b 4096 -C "key name" 
 "-t rsa" - specifies the type of key RSA 
 "b 4096" - Sets the key length to 4096 bits 
 "-C" - Adds a comment, optional 
 or use ed25519 for stronger encryption 
 ssh-keygen -t rsa -t ed25519 -C "key name" 
 
 
 Copy Public Key to Server 
 
 ssh-copy-id username@server_ip 
 Or if you make multiple different keys 
 ssh-copy-id -i ~/.ssh/id_rsa_work.pub 'name of the key you want to copy' username@server_ip 
 
 To See the public key 
 cat ~/.ssh/id_rsa.pub 
 More Info on managing multiple keys check Managing Multiple SSH Keys 
 When using Passphrase, it would be a good idea to have SSH Agent to manege them. More info at SSH Agent Management