| Developer(s) | The OpenBSD Project |
|---|---|
| Written in | C |
| Operating system | Unix, Unix-like, Microsoft Windows |
| Type | Command |
| License | BSD, ISC, public domain |
| Website | www.openssh.com |
ssh-keygen is a standard component of the Secure Shell (SSH) protocol suite found on Unix, Unix-like and Microsoft Windows computer systems used to establish secure shell sessions between remote computers over insecure networks, through the use of various cryptographic techniques. The ssh-keygen utility is used to generate, manage, and convert authentication keys.
Overview[edit]
SiteGround uses key-based authentication for SSH. This has proven more secure over standard username/password authentication. More information on SSH keys can be found here. You can generate an SSH key pair directly in cPanel, or you can generate the keys yourself and just upload the public one in cPanel to use with your hosting account. This module allows one to (re)generate OpenSSH private and public keys. It uses ssh-keygen to generate keys. One can generate rsa, dsa, rsa1, ed25519 or ecdsa private keys.
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ssh-keygen is able to generate a key using one of three different digital signature algorithms. With the help of the ssh-keygen tool, a user can create passphrase keys for any of these key types (to provide for unattended operation, the passphrase can be left empty, at increased risk). These keys differ from keys used by the related tool GNU Privacy Guard.
OpenSSH-based client and server programs have been included in Windows 10 since version 1803. The SSH client and key agent are enabled and available by default and the SSH server is an optional Feature-on-Demand.[1][2]
Key formats supported[edit]
| Protocol | Generation |
|---|---|
| RSA | 1 |
| DSA | 2 |
| ECDSA | 3 |
| ed25519 | 4 |
Originally, with SSH protocol version 1 (now deprecated) only the RSA algorithm was supported. As of 2016, RSA is still considered strong, but the recommended key length has increased over time.
The SSH protocol version 2 additionally introduced support for the DSA algorithm. As the DSA algorithm has ties to the American National Security Agency (NSA), aspects of its security have been called into question by Edward Snowden's global surveillance disclosures, particularly in light of the Bullrun decryption program.
Subsequently, OpenSSH added support for a third digital signature algorithm, ECDSA (this key format no longer uses the previous PEM file format for private keys, nor does it depend upon the OpenSSL library to provide the cryptographic implementation).
A fourth format is supported using ed25519, originally developed by independent cryptography researcher Daniel J. Bernstein.
ssh-keygen command syntax[edit]
The syntax of the ssh-keygen command is as follows:
Some important options of the ssh-keygen command are as follows:
| ssh-keygen command options | description |
|---|---|
| -b bits | Specifies the number of bits in the key to create. The minimum bit length is 1024 bits and the default length is 2048 bits. |
| -C comment | Provides new comment. |
| -p | Requests changing the passphrase of a private key file instead of creating a new private key. |
| -t | Specifies the type of key to create. |
| -o | Use the new OpenSSH format. |
| -q | quiets ssh-keygen. It is used by the /etc/rc file while creating a new key. |
| -N | Provides a new Passphrase. |
| -F (or -B) | For ssh-keygen2, dumps the key's fingerprint in Bubble Babble format |
Ssh-keygen Generate Dsa Key Generation
Files used by the ssh-keygen utility[edit]
The ssh-keygen utility uses various files for storing public and private keys. The files used by ssh-keygen utility are as follows:
- $HOME/.ssh/identity: The $HOME/.ssh/identity file contains the RSA private key when using the SSH protocol version 1.
- $HOME/.ssh/identity.pub: The $HOME/.ssh/identity.pub file contains the RSA public key for authentication when you are using the SSH protocol version 1. A user should copy its contents in the $HOME/.ssh/authorized_keys file of the remote system where a user wants to log in using RSA authentication.
- $HOME/.ssh/id_dsa: The $HOME/.ssh/id_dsa file contains the protocol version 2 DSA authentication identity of the user.
- $HOME/.ssh/id_dsa.pub: The $HOME/.ssh/id_dsa.pub file contains the DSA public key for authentication when you are using the SSH protocol version 2. A user should copy its contents in the $HOME/.ssh/authorized_keys file of the remote system where a user wants to log in using DSA authentication.
- $HOME/.ssh/id_rsa: The $HOME/.ssh/id_rsa file contains the protocol version 2 RSA authentication identity of the user. This file should not be readable by anyone but the user.
- $HOME/.ssh/id_rsa.pub: The $HOME/.ssh/id_rsa.pub file contains the protocol version 2 RSA public key for authentication. The contents of this file should be added to $HOME/.ssh/authorized_keys on all computers where a user wishes to log in using public key authentication.
References[edit]
- ^https://devblogs.microsoft.com/commandline/windows10v1803/
- ^https://devblogs.microsoft.com/powershell/using-the-openssh-beta-in-windows-10-fall-creators-update-and-windows-server-1709/
External links[edit]
| The Wikibook OpenSSH has a page on the topic of: ssh-keygen |
- Generating an SSH key, a guide from GitHub
- ssh-keygen manual from the OpenBSD project
- Linux man page from die.net
On Windows, you can create SSH keys in many ways. This document explains how to use two SSH applications, PuTTY and Git Bash.
Joyent recommends RSA keys because the node-manta CLI programs work with RSA keys both locally and with the ssh agent. DSA keys will work only if the private key is on the same system as the CLI, and not password-protected.
PuTTY
PuTTY is an SSH client for Windows. You can use PuTTY to generate SSH keys. PuTTY is a free open-source terminal emulator that functions much like the Terminal application in macOS in a Windows environment. This section shows you how to manually generate and upload an SSH key when working with PuTTY in the Windows environment.
About PuTTY
PuTTY is an SSH client for Windows that you will use to generate your SSH keys. You can download PuTTY from www.chiark.greenend.org.uk.
When you install the PuTTY client, you also install the PuTTYgen utility. PuTTYgen is what you will use to generate your SSH key for a Windows VM.
| This page gives you basic information about using PuTTY and PuTTYgen to log in to your provisioned machine. For more information on PuTTY, see the PuTTY documentation |
|---|
Generating an SSH key
To generate an SSH key with PuTTYgen, follow these steps:
- Open the PuTTYgen program.
- For Type of key to generate, select SSH-2 RSA.
- Click the Generate button.
- Move your mouse in the area below the progress bar. When the progress bar is full, PuTTYgen generates your key pair.
- Type a passphrase in the Key passphrase field. Type the same passphrase in the Confirm passphrase field. You can use a key without a passphrase, but this is not recommended.
- Click the Save private key button to save the private key. You must save the private key. You will need it to connect to your machine.
- Right-click in the text field labeled Public key for pasting into OpenSSH authorized_keys file and choose Select All.
- Right-click again in the same text field and choose Copy.
Importing your SSH key
Now you must import the copied SSH key to the portal.
- After you copy the SSH key to the clipboard, return to your account page.
- Choose to Import Public Key and paste your SSH key into the Public Key field.
- In the Key Name field, provide a name for the key. Note: although providing a key name is optional, it is a best practice for ease of managing multiple SSH keys.
- Add the key. It will now appear in your table of keys under SSH.
PuTTY and OpenSSH use different formats of public SSH keys. If the text you pasted in the SSH Key starts with —— BEGIN SSH2 PUBLIC KEY, it is in the wrong format. Be sure to follow the instructions carefully. Your key should start with ssh-rsa AAAA….
The license is already delivered to My VMware55.6 or 5.7YesYes. For more information, see.5.65.7NoThe existing license key also unlocks version 5.75.76.0YesYes. Vsphere 5.1 client.
Once you upload your SSH key to the portal, you can connect to your virtual machine from Windows through a PuTTY session.
Git Bash
The Git installation package comes with SSH. Using Git Bash, which is the Git command line tool, you can generate SSH key pairs. Git Bash has an SSH client that enables you to connect to and interact with Triton containers on Windows.
To install Git:
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- (Download and initiate the Git installer](https://git-scm.com/download/win).
- When prompted, accept the default components by clicking Next.
- Choose the default text editor. If you have Notepad++ installed, select Notepad++ and click Next.
- Select to Use Git from the Windows Command Prompt and click Next.
- Select to Use OpenSSL library and click Next.
- Select to Checkout Windows-style, commit Unix-style line endings and click Next.
- Select to Use MinTTY (The default terminal of mYSYS2) and click Next.
- Accept the default extra option configuration by clicking Install.
When the installation completes, you may need to restart Windows.
Launching GitBash
To open Git Bash, we recommend launching the application from the Windows command prompt:
- In Windows, press Start+R to launch the Run dialog.
- Type
C:Program FilesGitbinbash.exeand press Enter.
Generating SSH keys
How To Generate Ssh Dsa Key
First, create the SSH directory and then generate the SSH key pair.
One assumption is that the Windows profile you are using is set up with administrative privileges. Given this, you will be creating the SSH directory at the root of your profile, for example:
- At the Git Bash command line, change into your root directory and type.
Change into the .ssh directory
C:Usersjoetest.ssh- To create the keys, type:
- When prompted for a password, type apassword to complete the process. When finished, the output looks similar to:
Uploading an SSH key
To upload the public SSH key to your Triton account:
How To Create Ssh Keygen
- Open Triton Service portal, select Account to open the Account Summary page.
- From the SSH section, select Import Public Key.
- Enter a Key Name. Although naming a key is optional, labels are a best practice for managing multiple SSH keys.
- Add your public SSH key.
Ssh Keygen Parameters
When Triton finishes the adding or uploading process, the public SSH key appears in the list of SSH keys.
What are my next steps?
- Adding SSH keys to agent.
- Set up the Triton CLI and CloudAPI on Windows.
- Set up the Triton CLI and CloudAPI.
- Create an instance in the Triton Service Portal.
- Set up the
triton-dockercommand line tool. - Visit PuTTYgen to learn more about the PuTTYgen and to seethe complete installation and usage guide.