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Generate RSA keys with SSH by using PuTTYgen

1. Jan 29, 2017  SSH (Secure Shell) is an encrypted protocol that is way more secure than Plain text based protocols like Telnet, however, it’s could be vulnerable if not configured properly. We are assuming that you have root permission, otherwise, you may start commands with “sudo”. We are going to provide 4 simple tips to get a more Continue reading How to secure SSH.
2. Jul 29, 2014  If your Windows is Windows 10 Version 1803 like here, OpenSSH Client has been implemented as a Windows feature, so it's possbile to authenticate with SSH Key-Pair without Putty and others. Transfer the secret key to your Windows 10 and put it uder the (logon user home).ssh folder like follows, then it's ready to use Key-Pair login.

How to Generate SSH Keys on PuTTY. SSH keys are one of the most secure SSH authentication options. It is definitely more secure than the usual SSH password authentication. Therefore, it is highly recommended to use SSH Key authentication method for connections to your servers. The purpose of ssh-copy-id is to make setting up public key authentication easier. The process is as follows. Generate an SSH Key. With OpenSSH, an SSH key is created using ssh-keygen. In the simplest form, just run ssh-keygen and answer the questions. The following example illustates this. # ssh-keygen Generating public/private rsa key pair.

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.

Generate keys

In Windows, use PuTTYgen to generate your public and private keys.

1. If needed, download PuTTYgen from the PuTTY download page.(PuTTYgen might have been installed previously with PuTTY or WinSCP.)
2. Launch the program, and then click the Generate button.The program generates the keys for you.
3. 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.
4. Save the public and private keys by clicking the Save public keyand Save private key buttons.
5. 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

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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.

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Add a new public key to the list

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

Assign a public key

1. Under Advanced Options on the Create Server page, select the publickey you want to use from the SSH key drop-down menu.
2. 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

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To make use of your newly generated RSA key pair, you must tell PuTTY touse it when connecting to your cloud server.

1. To edit the file (or create it), run the following command on the cloud server:

2. 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.

3. If you created the authorized_keys file, change its permissionsafter you’re done editing it by running the following command:

4. Open PuTTY, and go to the SSH > Auth section.

5. Browse to the location of the key file, and load the private key.

6. 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.

/online-wifi-password-key-generator.html. After you save your session, your key is loaded automatically when youconnect to your server.

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To generate SSH public and private key pairs on Windows, one of the easiest tools to use, is the PuTTY Key Generator “puttygen.exe” (which can be downloaded from here).
The resulting generated files from the PuTTY Key Generator can be used to set up public key authentication with a remote server, allowing for more secure authentication over normal password based authentication (requires disabling password based authentication).
Download the PuTTY Key Generator
You can download puttygen from the following url:
https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
Run puttygen.exe
When puttygen has loaded you will be presented with a screen such as this:
Generate the public and private keys
Click the “Generate” button on the main window to start the process of generating the key data.
While this is happening, you will need to move your mouse around in the blank area at the top of the application. This is used to help randomize the data used to generate the keys.
Once the progress bar has gone through, the public and private key data will have been generated, and you are ready to save the keys.
Saving the public and private keys
Public Key:
Simply press the “Save public key” button. This will be used on the remote host you want to be able to connect into remotely, using the private key.
Private Key:
You have the option to enter a passphrase if you want to make the key more secure. Enter that in, and the confirmed passphrase.
After thats done (or if you dont want to use a passphrase), simply press the “Save private key” button. Store this key in a safe place.
Using the private key in PuTTY
For information on how to use the private key file in PuTTY, please check the following page:
Using SSH Private Key Files with PuTTY