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In such a case, you can ask the end user to provide herhis public key. Sshauthorizedkeys directory and then copy the public key here. set up public-key authentication using ssh on a linux or macos computer set up public-key authentication using putty on a windows 10 or windows 8. 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. Ssh-keygen then go through the steps, youll have two files, idrsa and idrsa. Pub (the first is your private key, the second is your public key - the one you copy to remote machines) then, connect to the remote machine you want to login to, to the file. Biz you store your public key on the remote hosts and you have an accounts on this linuxunix based server. Biz your private key stays on the desktoplaptop computer (or local server) you use to connect to server1. I want to add a user to red hat linux that will not use a password for logging in, but instead use a public key for ssh. Stack exchange network consists of 176 q&a communities including stack overflow, the largest,. The openssh public key is located in the box under key public key for pasting info openssh authorizedkeys file. The public key begins with ssh-rsa followed by a string of characters. Highlight entire public key within the putty key generator and copy the text. linux to create the key pair, use the following command ssh-keygen -b 2048 -t rsa -b 2048 is used to specify the desired key length -t rsa specifies that rsa keys are to be generated (use powers of two if you choose to increase the key length when prompted, enter the location to store the keys, or press enter to accept the default location.). In there, cutpaste your public ssh key, on one line (that is very important!) do not add the email protected at the end of the line.