![]() Set up public key authentication using SSH on a Linux or macOS computer For help, see Get started with Two-Step Login (Duo) at IU and Help for Two-Step Login (Duo). If you have questions about how two-factor authentication may impact your workflows, contact the UITS Research Applications and Deep Learning team. SSH public key authentication remains an option for researchers who submit the "SSH public key authentication to HPS systems" agreement (log into HPC everywhere using your IU username and passphrase), in which you agree to set a passphrase on your private key when you generate your key pair. Two-factor authentication using Two-Step Login (Duo) is required for access to the login nodes on IU research supercomputers, and for SCP and SFTP file transfers to those systems. Therefore, you must either be able to log into the remote system with an established account username and password/passphrase, or have an administrator on the remote system add the public key to the ~/.ssh/authorized_keys file in your account. You need to be able to transfer your public key to the remote system.This document includes instructions for generating a key pair with command-line SSH on a Linux or macOS computer, and with PuTTY on a Windows computer. The computer you use to connect to the remote server must have a version of SSH installed.If the remote system is using a different version of SSH (for example, Tectia SSH), the process outlined below may not be correct. The information in this document assumes the remote system uses OpenSSH. The remote system must have a version of SSH installed.Conceivably, you can share the public key with anyone without compromising the private key you store it on the remote system in a. You keep the private key a secret and store it on the computer you use to connect to the remote system. SSH public key authentication relies on asymmetric cryptographic algorithms that generate a pair of separate keys (a key pair), one "private" and the other "public". Using SSH public key authentication to connect to a remote system is a robust, more secure alternative to logging in with an account password or passphrase. Set up public key authentication using PuTTY on a Windows 11, Windows 10, or Windows 8.x computer.Set up public key authentication using SSH on a Linux or macOS computer.This way, you don't even need to remember IP addresses of the servers. It saves a lot of time and hassle.īy the way, if you use several servers, you can use ~/.ssh/config files and add server details there. This way, you don't need to enter the passwords for each user and each machine. Similarly, if you access several servers, you need to run ssh-copy-id for each server. You must know the password for each user, of course. If you use more than one user on the server, and you want password-less SSH access for all of them, you have to use the ssh-copy-id command for each users. Once you use the ssh-copy-id command successfuillu, you no longer have to enter password while using SSH to connect to the remote server.Īnd as you can see, it didn't ask for the password! Few things to know On the server, you can check the content of the authorized keys to see if your local system's key was added. ![]() ![]() The password was asked by SSH as it needs to access your remote system to copy your public key to the ~/.ssh directory and the file would be named as authorized_keys. If you notice carefully, I entered the password but still wasn't logged in to the system. It could be root or other user on the server for which you have access via password. Username is the user on the server, not the local machine. Once you are done with key generation, you can use the ssh-copy-id command in the following manner to copy the public key to your server: ssh-copy-id Step 1: Add the public key to your remote server ![]()
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