1. Sftp Host Key
2. Generate Ssh Key Known_hosts
3. Ssh Generate Key Known_hosts Key
4. Add Ssh Key Known_hosts
5. Ssh Add Known Host

Introduction

Establishing an SSH (Secure Shell) connection is essential to log in and effectively manage a remote server. Encrypted keys are a set of access credentials used to establish a secure connection.

SSH keys are a way to identify trusted computers, without involving passwords. The steps below will walk you through generating an SSH key and adding the public key to the server. Step 1: Check for SSH Keys First, check for existing SSH keys on your computer. Open Git Bash, Cygwin, or Terminal, etc. The /etc/ssh/sshknownhosts and /.ssh/knownhosts files contain host public keys for all known hosts. The global file should be prepared by the administrator (optional), and the per-user file is maintained automatically: whenever the user connects from an unknown host, its key. In OpenSSH, the collection of known host keys is stored in /etc/ssh/knownhosts and in.ssh/knownhosts in each user's home directory. Management of Host Keys. Host keys are cryptographic keys. The private keys should only be accessible to root. However, system administrators having root access to a server can obtain the server's private host key.

This guide will walk you how to generate SSH keys on Ubuntu 18.04. We will also cover setting up SSH key-based authentication to connect to a remote server without requiring a password.

• A server running Ubuntu 18.04
• A user account with sudo privileges
• Access to a terminal window / command line (Ctrl-Alt-T)

If you are already running an Ubuntu 18.04 server, you can skip this step. If you are configuring your server for the first time, you may not have SSH installed.

1. Start by installing the tasksel package:

The system will first ask for confirmation before proceeding:

Sftp Host Key

2. Next, use tasksel to install the ssh-server:

3. Load the SSH server service, and set it to launch at boot:

On your client system – the one you’re using to connect to the server – you need to create a pair of key codes.

To generate a pair of SSH key codes, enter the commands:

This will create a hidden directory to store your SSH keys, and modify the permissions for that directory. The ssh-keygen command creates a 2048-bit RSA key pair.

For extra security, use RSA4096:

Ms word key generator. Updated user interface.

If you’ve already generated a key pair, this will prompt to overwrite them, and those old keys will not work anymore.

The system will ask you to create a passphrase as an added layer of security. Input a memorable passphrase, and press Enter.

This process creates two keys. One is a public key, which you can hand out to anyone – in this case, you’ll save it to the server. The other one is a private key, which you will need to keep secure. The secure private key ensures that you are the only person who can encrypt the data that is decrypted by the public key.

Step 2- Copy Public Key to the Ubuntu Server

First, get the IP address of the Ubuntu server you want to connect to.

Generate Ssh Key Known_hosts

In a terminal window, enter:

The system’s IP address is listed in the second entry:

On the client system, use the ssh-copy-id command to copy the identity information to the Ubuntu server:

Replace server_IP with the actual IP address of your server.

If this is the first time you’re connecting to the server, you may see a message that the authenticity of the host cannot be established:

Type yes and press Enter.

The system will check your client system for the id_rsa.pub key that was previously generated. Then it will prompt you to enter the password for the server user account. Type it in (the system won’t display the password), and press Enter.

The system will copy the contents of the ~/.ssh/id_rsa.pub from the client system into the ~/.ssh/authorized_keys directory of the server system.

The system should display:

If your system does not have the ssh-copy-id command, you can copy the key manually over the SSH.

Use the following command:

To log in to a remote server, input the command:

The system should not ask for a password as it is negotiating a secure connection using the SSH keys. If you used a security passphrase, you would be prompted to enter it. After you do so, you are logged in.

If this is the first time you’ve logged into the server, you may see a message similar to the one in part two. It will ask if you are sure you want to connect – type yes and press Enter.

Step 4- Disable Password Authentication

This step creates an added layer of security. If you’re the only person logging into the server, you can disable the password. The server will only accept a login with your private key to match the stored public key.

Edit the sshd_config file:

Search the file and find the PasswordAuthentication option.

Edit the file and change the value to no:

Save the file and exit, then restart the SSH service:

Verify that SSH is still working, before ending the session:

If everything works, you can close out and resume work normally.

By following the instructions in this tutorial, you have setup SSH-key-based authentication on an Ubuntu 18.04 server.

The connection is now highly secure as it uses a set of unique, encrypted SSH keys.

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I’ve created my SSH keys but I’m unable to add them to my “known hosts file”
I followed these instructions:
https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys–2
everything works fine until I get to the
“Are you sure you want to continue connecting (yes/no)? yes”
after that I get nothing

Basically I’m using wordpress, server pilot, and digital ocean and want to create SSH keys as my droplet was created without them.

Ssh Generate Key Known_hosts Key

• SphericalCowApril 1, 2016

  you actually want to copy the public key (from your laptop/desktop) to the “~/.ssh/authorized_keys” file on the droplet server.

  the applicable line from the tutorial is below. When it gives the prompt “you want to continue connecting”, input “yes” and the droplet host fingerprint to your own laptop / desktop known_hosts file.

• sbklynApril 1, 2016

  Unfortunately I can’t get past that point, it asks me for a password and none of my passwords work. My problem is I already created the droplet without SSH as per the serverpilot instructions and have yet to find a way to enable the SSH keys after the fact.

  What am i supposed to replace “user” with? . i understand I need to add the correct IP

Add Ssh Key Known_hosts

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Ssh Add Known Host