https://helpdesk.strw.leidenuniv.nl/wiki/ 2026-04-04T03:06:14+00:00 https://helpdesk.strw.leidenuniv.nl/wiki/ https://helpdesk.strw.leidenuniv.nl/wiki/lib/exe/fetch.php?media=wiki:logo.png text/html 2025-08-20T10:44:02+00:00 Anonymous (anonymous@undisclosed.example.com) https://helpdesk.strw.leidenuniv.nl/wiki/doku.php?id=services:2fa:ssh:linux&rev=1755686642&do=diff Setup Linux ssh for key based login We need to create a private/public key set to allow passwordless login via ssh. To do this run the sshkey-gen command: $ ssh-keygen -t ecdsa Generating public/private ecdsa key pair. Enter file in which to save the key (/home/testuser1/.ssh/id_ecdsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/testuser1/.ssh/id_ecdsa Your public key has been saved in /home/testuser1/.ssh/id_ecdsa.pub Th… text/html 2021-03-29T07:45:26+00:00 Anonymous (anonymous@undisclosed.example.com) https://helpdesk.strw.leidenuniv.nl/wiki/doku.php?id=services:2fa:ssh:macos&rev=1617003926&do=diff Setup key based login from MacOS The procedure is very similar to the Linux procedure. So we first need to build a public/private keypair using the ssh-keygen utility: For both question about passphrase, just hit enter (we will not be using passphrases). This will also have generated two files in your personal .ssh directory: text/html 2021-03-26T15:31:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://helpdesk.strw.leidenuniv.nl/wiki/doku.php?id=services:2fa:ssh:putty&rev=1616772691&do=diff Setup key based login from Putty Before we can use key based login, we first need to create a private/public key set. This is done by the program PuTTYgen. Open this program: and provide a passphrase before hiting the 'Generate'key. You will have to move your mouse around as this will help randomness in the creation of the key pair. It is strongly advised to provide a complex passphrase which is not your account password!, as this is the only way to secure illegal use of your key pair. Once t… text/html 2021-03-22T13:51:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://helpdesk.strw.leidenuniv.nl/wiki/doku.php?id=services:2fa:ssh:tunnelier&rev=1616421118&do=diff Bitvise-tunnelier ssh setup with keys As all of you have heard by now, two factor authentication is becoming the standard for loging in to your email desktop ssh etc. This manual is for all of you who use Bitvise tunnelier to login into your windows desktop at work. To avoid having to generate a code on your PC or telephone every time you login there is an alternative method by means of SSH keys. text/html 2021-03-22T13:27:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://helpdesk.strw.leidenuniv.nl/wiki/doku.php?id=services:2fa:ssh:winscp&rev=1616419662&do=diff Setup WinSCP for file copy Before you can setup WinSCP with a key pair, you need to perform the necessary actions for putty key based access (see here). So you should already have a private key somewhere on your directory structure. This provate key will now be added tou your WinSCP setup. Open the