The use of OpenSSH is ubiquitous with secured access to client devices over a network. The purpose of SSH is straight-forward: To securely encapsulate the management traffic between two end-points, in this case using the server-client model for authentication.

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While SSH may be enabled to work over clients, which are joined to the same domain, say using Active Directory credentials, this is not possible when attempting to communicate to devices such as network switches or routers, which are not natively part of any domain infrastructure. Instead, these devices and Linux-based clients use a public/private key pair to verify the user attempting to connect to the client and perform authentication before providing remote access.

SEE: Information security policy (Tech Pro Research)

In this article, we will use this use case as it is often considered to be a more secure method of obtaining access, which lends itself seamlessly to Windows and non-Windows devices alike. By generating and managing SSH key pairs, IT will be able to remotely connect to clients in a secure manner while ensuring confidentiality and non-repudiation for each user, using a unique key pair tied to the individual's Windows login account for secure storage.

SSH Windows Client and Server. Microsoft Windows is the world's most popular operating system. In its different versions it is used extensively in practically every corporation - both on the users' desktops and in the servers of computing centers. (I) What is PuTTYgen? PuTTY Key Generator, a.k.a. PuTTYgen (an RSA and DSA key generation utility), is a free utility which generates keys for use with PuTTY SSH client, PuTTY authentication Pageant, and other programs in the PuTTY line. Generating an SSH Key on Windows - using PuTTY Gen: Download and install PuTTY. When the installation is complete, select and open the PuTTY Gen application. Set the Parameters by selecting the SSH-2 RSA radio button, and enter 2048 for the number of bits. Click Generate and the Key generation will begin.

Install the OpenSSH module for PowerShell

It is analogous to the ssh-keygen tool used in some other SSH implementations. The basic function is to create public and private key pairs. PuTTY stores keys in its own format in.ppk files. However, the tool can also convert keys to and from other formats. PuTTYgen.exe on Windows is a graphical tool. Then I looked up on the internet and found that I had to generate an ssh key for my account on GitHub. However, upon doing so, when I tried to do ssh-keygen -t rsa 'email@youremail.com' it simply said ssh-keygen is not recognized. I tried doing mkdir C: ssh but that didn't work. If it helps I'm using Ruby Rails and I'm on a Windows computer.

1. Log in to the Windows computer with an admin-level account and launch PowerShell with admin privileges.

2. Enter the following cmdlet to install the OpenSSH module. If this is the first time the module has been installed on the device, you may be prompted to download and install some additional tools. Type 'Y' to allow the tools to be installed.

Install-Module -Force OpenSSHUtils

3. Next, enter the cmdlet to start the ssh-agent service for securely storing privately generated SSH keys.

Start-Service ssh-agent

4. Last, enter the cmdlet to start the sshd service, which will generate the first pair of host keys automatically.

Start-Service sshd

Note: By default, the OpenSSH Server app in not installed, so it must first be installed. Also, the ssh-agent service is set to Disabled and must be changed before the cmdlets above will work. Host keys are stored at the %HOMEDRIVE%ProgramDatassh directory.

SEE: PowerShell scripting: Seven tips to reduce errors (free PDF) (TechRepublic)

Generate user key pair

1. In PowerShell, change directories to the path above where the SSH keys are stored, then enter the cmdlet below to being generating the key pair.

ssh-keygen

2. In order to generate a unique set of key pairs and store them, you will be prompted to provide a directory where the key pair will be stored, or you may press enter to choose the default location provided.

3. Next, you'll be prompted to choose a passphrase to encrypt the key pair with. While providing a passphrase is optional, it is highly advised to enter one as it serves the secondary purpose of acting as a form of two-factor authentication when utilizing the key pair to establish remote connections.

4. Once the process is completed, two files will be generated alongside the SHA256 fingerprint, and the key's random art image will be displayed on-screen and should look like this (Figure A):

Copying the public key securely

The OpenSSH tools include the SCP and SFTP utilities to make transferring keys completely secure. In order to properly configure a Windows client for authenticating via SSH keys, the public key (.PUB) file must be transferred to the client device's .ssh directory and stored in the authorized_keys text file.

1. Begin the process by executing the following command in PowerShell to create the .ssh directory within the user's profile folder.

ssh username@domain.com mkdir C:Usersusername.ssh

2. Using the SCP utility, enter the following command to securely copy the public key from the server to the client device.

scp C:Usersusername.sshid_rsa.pub username@domain.com:C:Usersusername.sshauthorized_keys

3. Lastly, modify the ACL on the authorized_keys file on the server by entering the following command.

ssh --% username@domain.com powershell -c $ConfirmPreference = 'None'; Repair-AuthorizedKeyPermission C:Usersusername.sshauthorized_keys

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Also see

• How to block SSH attacks on Linux with denyhosts (TechRepublic)
• How to install OpenSSH on Windows 10 to encrypt network communications (TechRepublic)
• How to enable two-factor authentication for SSH in Fedora Linux (TechRepublic)
• How to use ssh-agent to make working with secure shell more efficient (TechRepublic)
• 10 dangerous app vulnerabilities to watch out for (TechRepublic download)
• Online security 101: Tips for protecting your privacy from hackers and spies (ZDNet)
• The best password managers of 2019 (CNET)
• Cybersecurity and cyberwar: More must-read coverage (TechRepublic on Flipboard)

I run git push -u origin master

It tells me that 'Permission denied (public key) fatal: The remote end hung up unexpectedly'

Then I looked up on the internet and found that I had to generate an ssh key for my account on GitHub. However, upon doing so, when I tried to do ssh-keygen -t rsa 'email@youremail.com' it simply said ssh-keygen is not recognized. I tried doing mkdir C:ssh but that didn't work. If it helps I'm using Ruby Rails and I'm on a Windows computer. Could anyone help me?

culixuser1567909user1567909

14 Answers

2012:
ssh-keygen.exe is part of msysgit:

if your %PATH% includes C:pathtomsysgit1.7.11bin, you will have ssh-keygen.

Update 2015:
ssh-keygen.exe is part of Git For Windows, whose releases include PortableGit-2.4.3.1-2nd-release-candidate-64-bit.7z

That means the %PATH% must include c:pathtoPortableGit-2.4.3.1-2nd-release-candidate-64-bitusrbin (without the ssh-keygen.exe)

Roblox ben 10 omniverse games. As I explained before, Git for Windows will soon phase out msysgit.
I detailed in 'Why is it that if you download Git 2.0 from the net, you always get a 1.9.4 installer package?' how this new version is based on the more recent msys2 project.

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VonCVonC

I just had this issue and thought I'd share what I thought was an easier way around this.

Open git-bash and run the same command with the addition of -C since you're commenting in your email address: ssh-keygen -t rsa -C 'email@youremail.com' command. That's it.

git-bash should have been installed when you installed git. If you can't find it you can check C:Program FilesGitGit Bash

The first time I did this it failed to create the .ssh folder for me so I had to open a standard Command Prompt and mkdir C:Usersyourusername.ssh

I followed below in windows (With Git for Windows installed)

1. Run 'Git Gui' (Start --> Git --> Git Gui)
2. Click Help and then Show SSH Key
3. Click Generate Key if you do not have one already

Note:- this creates the key files under your personal profile folder C:UsersYourUserID.ssh

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I found an easy solution to fix this :

In the command prompt, go to your gitbin directory,and then execute your commands from here

No need to add anything to environmental variables! Just open up git bash and perform command the ssh-keygen in there.

Link to download git bash here

If you have installed Git, and is installed at C:Program Files, follow as below

1. Go to 'C:Program FilesGit'
2. Run git-bash.exe, this opens a new window
3. In the new bash window, run 'ssh-keygen -t rsa -C'
4. It prompts for file in which to save key, dont input any value - just press enter
5. Same for passphrase (twice), just press enter
6. id_rsa and id_rsa.pub will be generated in your home folder under .ssh

Just go to heroku.bat and add:

@SET PATH='D:Program Files (x86)Gitbin';%PATH% after @SET PATH=%HEROKU_RUBY%;%PATH%

in my case it's in D:Program Files (x86)Gitbin, change it to the path you've installed Git to. (i just left it with my path so it will be clearer on how to write this)

VladVlad

I think you can add the location of the file ssh-keygen.exe in the PATH environment variable. Follow the steps: Go to My Computer->Right click->Properties->Advanced System Settings->Click Environmental Variables. Now click PATH and then click EDIT. In the variable value field, go to the end and append ';C:pathtomsysgit1.7.11binssh-keygen.exe' (without quotes)

Nehal J WaniNehal J Wani

don't do anything just type in your command prompt

then you got like this

this should must work.

You probably should check this. Windows doesn't have that command built in.

Benjamin Tan Wei HaoBenjamin Tan Wei Haoemix

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I got it fixed by just adding ssh-keygen to my environment variables.

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for those who does not choose BASH HERE option. type sh in cmd then they should have ssh-keygen.exe accessible

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In my machine, ssh-keygen was available from powershell.

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