A key pair consists of two files, idrsa and idrsa.pub which are private and public keys respectively. The public key resides on the server side, whereas the private key is used when accessing it over SSH protocol. In the following example ssh-keygen command is used to generate the key pair. Ssh-keygen -m PEM -t rsa -b 4096 If you use the Azure CLI to create your VM with the az vm create command, you can optionally generate SSH public and private key files using the -generate-ssh-keys option. The key files are stored in the /.ssh directory unless specified otherwise with the.
Generate RSA keys with SSH by using PuTTYgen
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.
- 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.
![Rsa key generation program Rsa key generation program](/uploads/1/2/6/2/126207476/625375264.png)
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.
![Rsa Rsa](/uploads/1/2/6/2/126207476/202004971.png)
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.
After you save your session, your key is loaded automatically when youconnect to your server.
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SSH public key can be of different bit but to work on Acquia Cloud you require SSH key of 4096 bites.
Below is the method to generate SSH private/public key pair using the ssh-keygen command.
Step 1: Open Terminal and Run this commands to check you do not have public key saved on your system.
if the directory or file already exist, run following command to take backup and avoid overwrite
Step 2: Use Keygen command to generate new public/private key pair
Generate New Rsa Key Ubuntu Download
It will ask for several question. Like filename and passphrase. For filename Press enter to use default name and location and for passphrase you can enter your name or any string you remember. Check below output on my system.
Generate New Rsa Key Ubuntu 2017
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