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Generate RSA keys with SSH by using PuTTYgen

Thankfully, Puttygen does display the OpenSSH-compatible public key in the field labeled ‘Public key for pasting into OpenSSH’. Select all the text in this field and copy it to clipboard. Go back to the CloudSigma SSH key screen and paste this into the ‘public SSH key’ field. May 05, 2014 Install putty and generate ssh key to auto log in to Ubuntu server 14 Table of contents: 1. At the top of the window and select 'Export OpenSSH key', then save it as 'my-first-ssh-key.openssh.

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.

PuTTYgen is used to generate public or private key pair for creating SSH keys. Below is the complete guidance about how to generate RSA key in the Windows operating system: Once you install the PuTTY on your machine, you can easily run PuTTYgen. For the same, go to Windows - Start Menu - All Programs - PuTTY - PuTTYgen. Mar 28, 2018 Generating RSA-SSH Public Key, OpenSSH & PuTTY Compatible Private Keys using PuTTYgen. In a consideration of security, most of the remote SSH connectivity are now transforming to Password-less RSA Authentication. Basically in this method, authentication is being done on the basis of Private / Public key. In which, Server will have a Public Key and a Client should have corresponding Private key.

This article provides steps for generating RSA keys by using PuTTYgen onWindows for secure SSH authentication with OpenSSH.

Generate keys

G-force platinum key generator. In Windows, use PuTTYgen to generate your public and private keys.

If needed, download PuTTYgen from the PuTTY download page.(PuTTYgen might have been installed previously with PuTTY or WinSCP.)
Launch the program, and then click the Generate button.The program generates the keys for you.
Enter a unique key passphrase in the Key passphrase andConfirm passphrase fields.For additional information about using passphrases,see Log in with a SSH Private Key on Windows.
Save the public and private keys by clicking the Save public keyand Save private key buttons.
From the Public key for pasting into OpenSSH authorized_keys filefield at the top of the window, copy all the text (starting with ssh-rsa)to your clipboard by pressing Ctrl-C.You need this key available on your clipboard to paste eitherinto the public key tool in the Control Panel or directly into theauthorized keys on your cloud server.

Use the key pair

You can use the RSA key pair in the following ways.

Specify your SSH key when creating a new cloud server

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

Under Advanced Options on the Create Server page, click Manage SSHKeys.
Select public key for the cloud server from the SSH Keys listand click Add Public Key.
Enter the key name, select the region, and paste the entire publickey into the Public Key field. Then click Add Public Key.
Go back to the Create Server page, and confirm that your key is listedin the SSH Key list.

Assign a public key

Under Advanced Options on the Create Server page, select the publickey you want to use from the SSH key drop-down menu.
When you are done specifying the all the other details for the server,click Create Server.

Assign your SSH Key to an existing cloud server

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.