How to Generate SSH Public/Private Keys on Windows By Alexandru Andrei – Posted on Sep 17, 2019 Sep 17, 2019 in Windows If you ever managed a Linux server from Windows, you probably used PuTTY or at least heard about it. Oct 20, 2014 The private SSH key (the part that can be passphrase protected), is never exposed on the network. The passphrase is only used to decrypt the key on the local machine. This means that network-based brute forcing will not be possible against the passphrase. The private key is kept within a restricted directory. The option -y outputs the public key. From the linux manual for the ssh-keygen command:-y- This option will read a private OpenSSH format file and print an OpenSSH public key to stdout. Ssh-keygen -y -f /.ssh/idrsa /.ssh/idrsa.pub As a side note, the comment of the public key is lost. Mar 31, 2018 Generate public key and store into a file. It is a simple one liner command to generate a public key from a private key, so lets say our private key is named ‘[email protected]’ and we want to generate the public key and name it ‘authorizedkeys’. Below is the command to do this.
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How do I generate ssh RSA keys under Linux operating systems?
You need to use the ssh-keygen command as follows to generate RSA keys (open terminal and type the following command):ssh-keygen -t rsa
ORssh-keygen
Sample outputs:
The -t type option specifies the type of key to create. The possible values “rsa†or “dsa†for protocol version 2. The $HOME/.ssh stores the following two files:
Please do not share keys file with anyone else. You can upload keys to remote server as follows:ssh-copy-id [email protected]
Finally, you can login to remote server as follows:ssh [email protected]
scp file.txt [email protected]:~/data2/
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With a secure shell (SSH) key pair, you can create virtual machines (VMs) in Azure that use SSH keys for authentication, eliminating the need for passwords to sign in. This article shows you how to quickly generate and use an SSH public-private key file pair for Linux VMs. You can complete these steps with the Azure Cloud Shell, a macOS or Linux host, the Windows Subsystem for Linux, and other tools that support OpenSSH.
Note
VMs created using SSH keys are by default configured with passwords disabled, which greatly increases the difficulty of brute-force guessing attacks.
For more background and examples, see Detailed steps to create SSH key pairs.
For additional ways to generate and use SSH keys on a Windows computer, see How to use SSH keys with Windows on Azure.
Azure currently supports SSH protocol 2 (SSH-2) RSA public-private key pairs with a minimum length of 2048 bits. Other key formats such as ED25519 and ECDSA are not supported.
Use the ssh-keygen
command to generate SSH public and private key files. By default, these files are created in the ~/.ssh directory. You can specify a different location, and an optional password (passphrase) to access the private key file. If an SSH key pair with the same name exists in the given location, those files are overwritten.
The following command creates an SSH key pair using RSA encryption and a bit length of 4096:
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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 --ssh-dest-key-path
option. The --generate-ssh-keys
option will not overwrite existing key files, instead returning an error. In the following command, replace VMname and RGname with your own values:
To create a Linux VM that uses SSH keys for authentication, specify your SSH public key when creating the VM using the Azure portal, Azure CLI, Azure Resource Manager templates, or other methods:
If you're not familiar with the format of an SSH public key, you can display your public key with the following cat
command, replacing ~/.ssh/id_rsa.pub
with the path and filename of your own public key file if needed:
A typical public key value looks like this example:
If you copy and paste the contents of the public key file to use in the Azure portal or a Resource Manager template, make sure you don't copy any trailing whitespace. To copy a public key in macOS, you can pipe the public key file to pbcopy
. Similarly in Linux, you can pipe the public key file to programs such as xclip
.
The public key that you place on your Linux VM in Azure is by default stored in ~/.ssh/id_rsa.pub, unless you specified a different location when you created the key pair. To use the Azure CLI 2.0 to create your VM with an existing public key, specify the value and optionally the location of this public key using the az vm create command with the --ssh-key-values
option. In the following command, replace VMname, RGname, and keyFile with your own values:
If you want to use multiple SSH keys with your VM, you can enter them in a space-separated list, like this --ssh-key-values sshkey-desktop.pub sshkey-laptop.pub
.
With the public key deployed on your Azure VM, and the private key on your local system, SSH into your VM using the IP address or DNS name of your VM. In the following command, replace azureuser and myvm.westus.cloudapp.azure.com with the administrator user name and the fully qualified domain name (or IP address):
If you specified a passphrase when you created your key pair, enter that passphrase when prompted during the login process. The VM is added to your ~/.ssh/known_hosts file, and you won't be asked to connect again until either the public key on your Azure VM changes or the server name is removed from ~/.ssh/known_hosts.
If the VM is using the just-in-time access policy, you need to request access before you can connect to the VM. For more information about the just-in-time policy, see Manage virtual machine access using the just in time policy.
For more information on working with SSH key pairs, see Detailed steps to create and manage SSH key pairs.
If you have difficulties with SSH connections to Azure VMs, see Troubleshoot SSH connections to an Azure Linux VM.