Now a Window appears where we add public SSH key. Thus, we use OpenSSL to generate a key for Linux and macOS. We use PuTTYgen to generate a key in the Windows machine. Let us discuss both the methods used to generate a key in the customers local machine. 1) Generate SSH key with OpenSSL for Droplet. Add your SSH private key to the ssh-agent and store your passphrase in the keychain. If you created your key with a different name, or if you are adding an existing key that has a different name, replace idrsa in the command with the name of your private key file. Go to Windows Start menu → All Programs → PuTTY → PuTTYgen. Creating a new key pair for authentication. To create a new key pair, select the type of key to generate from the bottom of the screen (using SSH-2 RSA with 2048 bit key size is good for most people; another good well-known alternative is ECDSA). Jun 22, 2012 How To Set Up SSH Keys Step One—Create the RSA Key Pair. Step Two—Store the Keys and Passphrase. You can press enter here. Step Three—Copy the Public Key. Once the key pair is generated. Optional Step Four—Disable the Password for Root Login.
One effective way of securing SSH access to your cloud server is to usea public-private key pair. This means that a public key is placed onthe server and a private key is placed on your local workstation.Using a key pair makes it impossible for someone to log in by using justa password, as long as you set up SSH to deny password-basedauthentication.
This article provides steps for generating RSA keys by using PuTTYgen onWindows for secure SSH authentication with OpenSSH.
In Windows, use PuTTYgen to generate your public and private keys.
You can use the RSA key pair in the following ways.
When you create a cloud server, you can assign a public key from the list of keys.If your key is not already in the list, you may add it, and then assign it.
Add a new public key to the list
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Assign a public key
To make use of your newly generated RSA key pair, you must tell PuTTY touse it when connecting to your cloud server.
To edit the file (or create it), run the following command on the cloud server:
Paste the text onto its own line in the file.
You must have the key available in your clipboard to paste it. The key and itsassociated text (the ssh-rsa identified at the start and the comment at the end)must be on one line in the file. If the text is word-wrapped onto multiple linesan error might occur when connecting.
If you created the authorized_keys file, change its permissionsafter you’re done editing it by running the following command:
Open PuTTY, and go to the SSH > Auth section.
Browse to the location of the key file, and load the private key.
Go to the Session page, and save the session. This saves the configurationso that PuTTY uses the key every time that you connect to your cloudserver.
After you save your session, your key is loaded automatically when youconnect to your server.
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You have seen in previous tutorials how to use PuTTY to connect to your VPS securely and how to create SSH keys with PuTTYgen.
You might have more than one SSH key for a single cloud server, or simply more than one cloud server or Droplet that requires SSH keys to log into. This can make you feel overwhelmed with having to manage, sort out, and link all those keys to their respective servers. That’s why Pageant exists.
Pageant is a PuTTY authentication agent. It holds your private keys in memory so that you can use them whenever you are connecting to a server. It eliminates the need to:
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Make sure you have these prerequisites.
Start Pageant from the PuTTY folder: Start-Menu > All Programs > PuTTY > Pageant
Pageant starts by default minimized in the system tray. To begin adding your SSH keys, you should right click on its icon and then the following context menu will show up:
Clicking on Add Key from the menu or View Keys to open up the Pageant Key List window. Here you can view, add, and remove keys:
Tip: You can access the Pageant Key List window directly by double-clicking its icon in the system tray.
Click the Add Key button. This will open the file explorer, where you can choose one or more keys at a time to load. You should select files with the .ppk extension:
Click the Open button to load the keys with Pageant.
If a key is passphrase-protected, you will be prompted to enter the passphrase only once before it can be added to the Pageant Key List:
After successfully adding a key, you can now see it listed:
Now these keys will be available while connecting to any server during your PuTTY sessions. You don’t have to take any extra steps in PuTTY. Just enter your hostname or IP address, and SSH user. PuTTY will automatically try to authenticate using any keys currently loaded in Pageant.
If you want to remove a key from Pageant, select that key from the Pageant Key List window and press the Remove Key button. You can also remove multiple keys together by selecting them with CTRL or SHIFT.
Use these tips to automate your authenticated connections with Pageant.
You can make Pageant automatically load one or more private keys when it starts up, instead of adding them manually every time you start up Pageant.
Go to the Pageant shortcut icon from the Windows Start Menu or your desktop.
Right click on the icon, and click on Properties.
A new window will open containing the shortcut’s properties:
From the Shortcut tab, edit the Target field. Leave the path to pageant.exe intact. After that path, add paths to your .ppk key files. These should be outside the quotation marks. Here’s an example:
Click the Apply and then OK buttons.
Note: If the keys are encrypted, Pageant will request the passphrases on startup.
You can make Pageant start PuTTY or any other program once it has initialized itself and loaded any keys specified on its command line. That way you can just start Pageant instead of having to start both programs.
You can achieve this by following the same steps we used previously to add the keys automatically (see the previous section). Just add the program’s path at the end of the command in the Target field, preceded by the -c option, and contained within double quotes. Here’s an example of the full line for the Target field:
Here are a few other helpful applications that can work with PuTTY.