How to setup SSH in GitHub

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Related : Computer Networks, Github SSH
Q. What the hell is SSH? ⇒ See SSH.

Steps to create SSH key :

1. First we need to check if we have a SSH key already generated for the system/local machine,we want to get authenticated or not.¹

   Steps to check for SSH

   • Open terminal
   • ls -al ~/.ssh // lists if anything exists in the ssh folder
   • public keys maybe of the following names : - id_rsa.pub - id_ecdsa.pub - id_ed25519.pub If present use that public key otherwise generate new key.

2. Steps to generate new key if it doesn't exists

   • Open Terminal
   • ssh-keygen -t ed25519 -C "complete_email_id" - ed25519 is algorithm used for generating the key-pair - t flag : used to select the algorithm - C flag: used for commenting for the key. Example : ssh-keygen -t ed25519 -C 23prakhargarg2002@gmail.com If a file already exists then you can use a custom name for the file

3. Add the generated ssh public to GitHub using the following steps

   1. Open GitHub settings.
   2. Go to SSH and GPG keys
   3. Click New SSH key or Add SSH key.
   4. Name the SSH key using title
   5. Now on your personal computer get the content of public key you generated cat ~/.ssh/id_ed25519.pub and copy the output.
   6. Paste the content in the blank field provided on GitHub new ssh key area and press add key.
   7. You can test the connection by using the following command.² ssh -T git@github.com

Further things to explore attaching the hardware key to authenticate to github. Generating a new SSH key for hardware

References::

1. Generating a new SSH key and adding it to the ssh-agent - GitHub Docs

Foot-notes::

Footnotes

1. Checking for existing SSH keys - GitHub Docs ↩

2. Testing your SSH connection - GitHub Docs ↩