SSH keys can serve as a means of identifying yourself to an SSH server using public-key cryptography and challenge-response authentication.The major advantage of key-based authentication is that in contrast to password authentication it is not prone to brute-force attacks and you do not expose valid credentials, if the server has been compromised. Aug 07, 2019 How do I set up SSH keys on a Linux or Unix based systems? In SSH for Linux/Unix, how do I set up public key authentication? This page explains a public key and shows you how to set up SSH keys on a Linux or Unix-like server. I am assuming that you are using Linux or Unix-like server and client with the following software. SSH keys serve as a means of identifying yourself to an SSH server using public-key cryptography and challenge-response authentication.One immediate advantage this method has over traditional password authentication is that you can be authenticated by the server without ever having to send your password over the network.
[donotprint][/donotprint]To regenerate keys you need to delete old files and reconfigure openssh-server. It is also safe to run following commands over remote ssh based session. Your existing session shouldn’t be interrupted.
Advertisements
Why regenerate new ssh server keys?
Most Linux and Unix distribution create ssh keys for you during the installation of the OpenSSH server package. But it may be useful to be able re-generate new server keys from time to time. For example, when you duplicate VM (KVM or container) which contains an installed ssh package and you need to use different keys from cloned KVM VM guest/machine.
Steps to regenerate OpenSSH host keys on Linux
Let us see all steps
Step 1 – Delete old ssh host keys
Login as the root and type the following command to delete files on your SSHD server:
# /bin/rm -v /etc/ssh/ssh_host_* Sample outputs: Generate Ssh Key Arch Linux VersionStep 2 – Debian or Ubuntu Linux Regenerate OpenSSH Host Keys
Generating rsa key pair in linux. Now create a new set of keys on your SSHD server, enter:
# dpkg-reconfigure openssh-server Sample output: Generate Ssh Key Github
You just regenerated new ssh server keys. You need to restart ssh server:
$ sudo systemctl restart ssh OR $ /etc/init.d/ssh restart
Step 3 – Update all ssh client(s) known_hosts filesMac Generate Ssh Key
Finally, you need to update ~/.ssh/known_hosts files on client computers, otherwise everyone will see an error message that read as follows:
Either remove host fingerprint or update the file using vi text editor (command must be typed on client machine):
$ ssh-keygen -R remote-server-name-here Now login using the ssh command: $ ssh [email protected]
ConclusionGenerate Ssh Key Arch Linux Server
You just regenerated OpenSSH Host Keys on a Debian or Ubuntu Linux using the dpkg-reconfigure command. For more info see the man page or this wiki page here:
$ man dpkg-reconfigure
Generate Ssh Key Putty
ADVERTISEMENTS
Comments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |