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1.1 Download PuTTY for Windows Operating System (Released 27 June 2020).Vi ~/.ssh/authorized_keys2 ssh-rsa AAAAB3NzaC1yc2EALg5whU0zMuYE5IZu8ZudnP6ds= file must be write/readable only by that user, so we runĬhmod 600 ~/. Then log in to your SSH server (if you have closed the previous SSH session already), still with the username and password, and paste the public key into the file ~/.ssh/authorized_keys2 (in one line!) like this: Then copy the public key from the PuTTYgen window:
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You can save it in the same location as the public key - it should be a location that only you can access and that you don't lose! (If you lose the keys and have disabled username/password logins, then you can't log in anymore!) Again, you're free to choose a filename, but this time the extension must be. You are free to choose a filename and extension, but it should be one that lets you remember for which system it is.
Then click on Save publick key and save it in some safe location on your computer. You'll need that passphrase to log in to SSH with your new key. Then specify a Key passphrase and repeat it under Confirm passphrase. Under Key comment, you can enter any comment normally you use your email address here. Now a private/public key pair has been generated. Please move the mouse pointer over the blank area during the key generation to generate some randomness: Make sure you select SSH-2 RSA under Type of key to generate and specify 1024 as the Number of bits in a generated key. Start it by double-clicking its executable file. We can use PuTTYgen to create a private/public key pair. So if you have weak passwords and/or are the victim of a brute-fore attack, this can become a problem. If anyone else knows the username and password, he can log in, too. Now this was the "normal" way of logging in, i.e., with a username and a password. We only have to specify that user's password: We have saved the username with which we connect in our profile settings, so we don't have to type it here again. (If this happens again later on, this can mean that another server is now running under the same IP address, or that someone has broken in and changed the key.) This is because PuTTY doesn't know the server's host key yet, so it is safe to click on Yes. If you connect to the server for the first time, a security warning pops up. Now we can connect to our SSH server simply by clicking on Open. 192.168.0.100 or any other string that lets you remember for which server the profile is. Under Saved Sessions enter a name for the profile, e.g. Then go to Connection -> Data and specify the username with that you want to log in to your SSH server under Auto-login username. Enter 192.168.0.100 under Host Name (or IP address), enter 22 under Port and select SSH under Protocol: You are now in the category Session (see the tree on the left side of the screenshot). Start PuTTY by double-clicking its executable file. Let's create a profile for our 192.168.0.100 server. In PuTTY, you can create profiles for connections to your various SSH servers, so you don't have to type in the settings again when you want to connect to a certain server again. on the desktop:ģ Create A Profile With Settings For Our 192.168.0.100 Server To start them, we only need to double-click them.ĭownload the following files from the PuTTY download page and save them on your Windows system, e.g.
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We don't need to install them as they are standalone applications. All we need to do is download the exectuable files (. In this tutorial I use a Windows desktop to connect to a Linux SSH server (Debian Sarge, IP address: 192.168.0.100).Ģ Install PuTTY, PuTTYgen, And Pageant On The Windows Systemįirst we need to install PuTTY, PuTTYgen, and Pageant on our Windows system. That way, there is no way for brute-force attacks to be successful, so your system is more secure. Using key-based SSH logins, you can disable the normal username/password login procedure which means that only people with a valid private/public key pair can log in. PuTTY is an SSH client that is available for Windows and Linux (although it is more common on Windows systems).
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This guide describes how to generate and use a private/public key pair to log in to a remote system with SSH using PuTTY. Password-less SSH Login with PUTTY (Windows)