How do I set up an SSH key?

How do I set up an SSH key?

Open a terminal and use the ssh-keygen command with the -C flag to create a new SSH key pair. Replace the following: KEY_FILENAME : the name for your SSH key file. For example, a filename of my-ssh-key generates a private key file named my-ssh-key and a public key file named my-ssh-key.

Where do I put SSH keys in Linux?

SSH keys are typically configured in an authorized_keys file in . ssh subdirectory in the user’s home directory. Typically a system administrator would first create a key using ssh-keygen and then install it as an authorized key on a server using the ssh-copy-id tool.

How do I manually add a SSH key?

Manually Copy Your Public Key

  1. Begin by copying the contents of your public SSH key on your local computer.
  2. Once you have copied that text, use the command ssh to add the key.
  3. Create the ~/.ssh directory and authorized_keys file if they don’t already exist: mkdir -p ~/.ssh && touch ~/.ssh/authorized_keys.

How do I create a private key?

How to Create a Public/Private Key Pair

  1. Start the key generation program.
  2. Enter the path to the file that will hold the key.
  3. Enter a passphrase for using your key.
  4. Re-enter the passphrase to confirm it.
  5. Check the results.
  6. Copy the public key and append the key to the $HOME/.

How do SSH keys work?

An SSH key relies upon the use of two related keys, a public key and a private key, that together create a key pair that is used as the secure access credential. The private key is secret, known only to the user, and should be encrypted and stored safely.

How do I configure SSH key based authentication on a Linux server?


  1. Use the ssh-keygen tool to create a key pair.
  2. Validate that the keys were generated.
  3. Enable key-based authentication in the /etc/ssh directory on the SSH server.
  4. Copy the rsa.
  5. If you have an existing authorized_keys file, edit it to remove any no-pty restrictions.

Where do I put SSH keys on my server?

How to add new SSH key to a cloud server

  1. Connect to the server using your current key. ssh [email protected] -i /current_private_ssh_key.
  2. Add a public key to the “authorized_keys” file. You can add a public key to the “authorized_keys” file using “nano” text editor (or any text editor of your choice):
  3. Verify new key.

Are SSH keys easier to manage?

SSH keys are harder to crack and much easier to use than passwords, which makes them the default choice for the SSH protocol. However, to achieve these benefits, organizations must introduce proper SSH key management.

How often should you change SSH keys?

They say that you should rotate SSH public keys approximately every month-and-a-half (i.e., every 45 days).

Where do I put SSH public key on server?

The public key is uploaded to a remote server that you want to be able to log into with SSH. The key is added to a special file within the user account you will be logging into called ~/. ssh/authorized_keys .

What is SSH config file?

Your SSH config file allows you to define specific settings for each SSH host that makes connecting to that host far easier. By defining many of these common, or uncommon, properties within the file, it eliminates the need to remember this parameter set each and every time a connection is needed.

How do I find my SSH public key?

Checking for existing SSH keys

  1. Open .
  2. Enter ls -al ~/. ssh to see if existing SSH keys are present.
  3. Check the directory listing to see if you already have a public SSH key. By default, the filenames of supported public keys for GitHub are one of the following.
  4. Either generate a new SSH key or upload an existing key.

Are SSH keys machine specific?

SSH key pair’s are machine independent, which means you can create a SSH key pair on one machine and can deploy the same SSH key pair on multiple machines.

Are SSH keys PKI?

An SSH key is a secure access credential used in the Secure Shell (SSH) protocol. SSH keys use key pairs based on public key infrastructure (PKI) technology, the gold standard for digital identity authentication and encryption, to provide a secure and scalable method of authentication.

How does SSH know which key?

When a client connects to the host, wishing to use SSH key authentication, it will inform the server of this intent and will tell the server which public key to use. The server then checks its authorized_keys file for the public key, generates a random string, and encrypts it using the public key.

How often should you change your SSH keys?

What is the most secure SSH key type?

As of 2020, the most widely adopted algorithms are RSA, DSA, ECDSA, and EdDSA, but it is RSA and EdDSA that provide the best security and performance.

Does SSH key expire?

SSH Key pairs in general do not have an expiration date because they do not have metadata outside of their key strings.