![]() If you don't have an existing public-private key pair, use the following command to generate it. You will be asked to re-enter the passphrase. Do not hit Enter! Enter a long and difficult to guess passphrase that is easy to remember. Next you will be prompted to enter a new passphrase. In that case you have already done this step. If you already have a passphrase set, you will be asked to enter the existing passphrase. Hit enter to accept the default location. You wil be prompted for the the location where to keep the files. Add a passphrase to the existing public-private keyfor each client and user combinationsįor each user on each client computer or device use the following command to generate a passphrase for the exiting public-private key pair: ssh-keygen -p The other scenario is, if I have multiple servers to ssh to and if I use the same private key to authenticate myself to all the servers, I will need to use the same passphrase to access ssh in all the servers I work with, not just your board. I can even remove the passphrase from my private key without telling you. The upshot of this arrangement is, I can change the passphrase of my private key any time without telling you, or changing anything to the server computer (the board). I will have my own private key and its passphrase. You will have your own private key and a passphrase for that private key. Similarly, if two different users need to ssh to the server (board) from their own respective local computers, they will need their own private-public key pairs and own passphrase to unlock their respective private keys.įor example, say you and I need to ssh to the same server computer (the board) from our own laptops. ![]() Thus, if you use two different client computers of devices to ssh from, then you will have to create a passphrases for the private keys stored in each local computer. The passphrase is linked to the private key in the client (local) computer, not to the remote server (board) computer. If the board has multiple user accounts, they should have their unique passwords. If the board has only one user account, then it will have only one password. The password in this context is the password assigned to the user in the server computer (the board). The difference between the password and the passphrase: There are two ways to configure ssh to require both a public key and a password or passphrase. SSH login require private key and password also.Īfter logout and after sometime login again, ssh doesn't require key or password, project requirement need key and password each and everytime. To achive more security SSH password based login, we shifted to key based login.Īs explain above after change all configuration. Project requirement is secure login, mainly on ssh. I played with below settings but failed it all the time. Ssh //not able to login without key - works fineĪs per my understanding, I made a mistake in the sshd_config file on the board. Ssh //never ask password and public key - problem ![]() In second time login, ssh doesn't ask private key or password, directly login on board.Ĭlient side use Ubuntu 16.04 and on board customizes Ubuntu. When a client logs in for the first time, ask about private key and passphrase also which works fine. I developed successfully RSA Key based ssh login on board from system.
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