![]() Note that the ssh-copy-id command will require that the account you are uploading the public key for already have SSH access to the destination server.ssh]$ ssh-copy-id Next upload the public key to the remote server that you wish to access, this can be done manually or with the ssh-copy-id command as shown below. In the above example we created the id_rsa private key file and corresponding id_rsa.pub public key file. Your identification has been saved in /home/bob/.ssh/id_rsa. ~]$ ssh-keygen -t rsaĮnter file in which to save the key (/home/bob/.ssh/id_rsa):Įnter passphrase (empty for no passphrase): The -t flag specifies the type of key to create, here we are using rsa version 2. ![]() To create the key pair run the ‘ssh-keygen’ command as the user that you want to generate the key pair for, for instance as the root user you can generate a key for bob by first changing to bob with ‘su bob’ then running ‘ssh-keygen’ as below. It’s also important that the private key file be readable and writable only by the user that owns the key, this would be permissions 0600 and is set as default on creation. Best practices dictate that your private key be encrypted with a passphrase which can be configured when you create the key pair. It is therefore extremely important that you protect your private key, if an attacker is able to access this key then they will be able to log in as your user. The public key is stored on the destination server that you wish to access and will allow only the corresponding private key access. ![]() SSH keys are based upon public-key cryptography, whereby you will generate a key pair which includes a public key and a private key. Studying for your RHCE certification? Checkout our RHCE video course over at Udemy which is 20% off when you use the code ROOTUSER. Our test server in this example is running CentOS 7. Here we are going to cover how to configure and use key-based authentication for SSH in Linux. SSH keys are typically preferable in terms of security when compared to passwords as they are far less vulnerable to brute force attack, there is simply a lot more entropy in a key than password. SSH keys can be used to increase the level of security for a user remotely authenticating to a Linux server through SSH.
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