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Jun 26, 2019 To set up SSH key authentication for one of your server’s users, add your public key to a new line inside the user’s authorizedkeys file. This file is stored inside a directory named.ssh/ under the user’s home folder. A user’s authorizedkeys file can store more than one public key, and each public key is listed on its own line. If you ever managed a Linux server from Windows, you probably used PuTTY or at least heard about it. It’s an excellent utility and has been a favorite SSH client for years. Generate Public/Private SSH Key Pair. Open Command Prompt from the Start Menu. Set up public-key authentication using SSH on a Linux or macOS computer. To set up public-key authentication using SSH on a Linux or macOS computer: Log into the computer you'll use to access the remote host, and then use command-line SSH to generate a key pair using the RSA algorithm. If you generate the key for the user you also have to have a secure method of getting the private key and it's pass phrase to the user. Much better the user generate the key and then just email you the public key. – user9517 Oct 22 '11 at 20:02.

• Unix User Generate Public Key West
• Unix User Generate Public Key In Command Prompt

How do I generate ssh keys under Linux / UNIX / Mac OS X and *BSD operating systems for remote login?
SSH uses public-key cryptography to authenticate the remote computer and allow the remote computer to authenticate the user, if required. You can create ssh keys as follows on any Linux or UNIX-like operating systems including Mac OS X.[donotprint][/donotprint]

ssh-keygen command to Generate SSH Keys

The ssh-keygen command generates, manages and converts authentication keys for ssh client and server usage. Type the following command to generate ssh keys (open terminal and type the command):
$ ssh-keygen
Generate SSH keys looks as follows:

The above command creates ~/.ssh/ directory. So if your user name is vivek, than all files are stored in /home/vivek/.ssh/ or $HOME/.ssh/ directory as follows:

• $HOME/.ssh/id_rsa – Your private key. Do not share this file with anyone. Keep it private
• $HOME/.ssh/id_rsa.pub– Your public key.

Generate keys for auto-renewable subscriptions online. Please note that the passphrase must be different from your current password and do not share keys or passphrase with anyone. Also, make sure you have correct and secure permissions on $HOME/.ssh/ directory:

SSH Keys Are Generated, What Next?

You need to copy $HOME/.ssh/id_rsa.pub file to remote server so that you can login using keys instead of the password. Use any one of the following command to copy key to remote server called vpn22.nixcraft.net.in for vivek user:
ssh-copy-id vivek@vpn22.nixcraft.net.in
On some *nix system such as OS X ssh-copy-id command may not be installed, use the following commands (when prompted provide the password for remote user account called vivek) to install/append the public key on remote host:
ssh vivek@vpn22.nixcraft.net.in 'umask 077; mkdir .ssh'
cat $HOME/.ssh/id_rsa.pub ssh vivek@vpn22.nixcraft.net.in 'cat >> .ssh/authorized_keys'
To login simply type:
ssh vivek@vpn22.nixcraft.net.in
The following command will help to remember passphrase
exec ssh-agent $SHELL
ssh-add
ssh vivek@vpn22.nixcraft.net.in

Optional ssh-keygen command syntax for advance users

The following syntax specifies the 4096 of bits in the RSA key to creation (default 2048):
ssh-keygen -t rsa -b 4096 -f ~/.ssh/aws.key -C 'My AWs cloud key'
Where,

• -t rsa : Specifies the type of key to create. The possible values are “rsa1” for protocol version 1 and “dsa”, “ecdsa”, “ed25519”, or “rsa” for protocol version 2.
• -b 4096 : Specifies the number of bits in the key to create.
• -f ~/.ssh/aws.key : Specifies the filename of the key file.
• -C 'My AWs cloud key' : Set a new comment.

Now install the ~/.ssh/aws.key, run:
ssh-copy-id -i ~/.ssh/aws.key user@aws-server-ip
Test it with the ssh command:
ssh -i ~/.ssh/aws.key ec2-user@aws-server-ip
See “How To Set up SSH Keys on a Linux / Unix System” for more info.

Conclusion

You learned how to create and generate ssh keys using the ssh-keygen command.

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Unix User Generate Public Key West

• Howto Linux / UNIX setup SSH with DSA public key authentication (password less login)
• sshpass: Login To SSH Server / Provide SSH Password Using A Shell Script
• keychain: Set Up Secure Passwordless SSH Access For Backup Scripts
• Openssh man pages here
• Man pages – ssh-keygen(1)

Unix User Generate Public Key In Command Prompt

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