How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
You need to use a command called ssh-keygen. This command generates, manages and converts authentication keys for ssh. It can create RSA keys for use by SSH protocol version 1 and RSA or DSA keys for use by SSH protocol version 2. he type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key for use in SSH protocol 2 connections. The -f option specifies the filename of the key file.
Before adding a new SSH key to the ssh-agent to manage your keys, you should have checked for existing SSH keys and generated a new SSH key. When adding your SSH key to the agent, use the default macOS ssh-add command, and not an application installed by macports. If you don't already have an SSH key, you must generate a new SSH key.If you're unsure whether you already have an SSH key, check for existing keys. If you don't want to reenter your passphrase every time you use your SSH key, you can add your key to the SSH agent, which manages your SSH keys and remembers your passphrase.
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Why create a new host key files?
You may need a new key file:
ssh-keygen Syntax
The syntax is:
Returns a KeyPairGenerator object that generates public/privatekey pairs for the specified algorithm.A new KeyPairGenerator object encapsulating theKeyPairGeneratorSpi implementation from the specified provideris returned. The specified provider must be registeredin the security provider list.Note that the list of registered providers may be retrieved viathe method. Parameters: algorithm - the standard string name of the algorithm.See the KeyPairGenerator section in thefor information about standard algorithm names. Returns: the new KeyPairGenerator object. Ecc key pair generation java. Provider - the string name of the provider.
Example
Create a host key file in your $HOME/.ssh/myapp as follows. First, create a directory to store your host key file, enter:
$ mkdir -p $HOME/.ssh/myapp To create a host RSAv2 key file, run: $ ssh-keygen -t rsa -f $HOME/.ssh/myapp/rsa_key_file Sample outputs:
Type the following commands to verify the keys:
$ ls -l $HOME/.ssh/myapp/ Sample outputs:
You can now use keys with your app:
$ mycool-app -key $HOME/.ssh/myapp/rsa_key_file -d
ADVERTISEMENTS How do I regenerate OpenSSH sshd server host keys stored in /etc/ssh/ssh_host_* files? Can I safely regenerate ssh host keys using remote ssh session as my existing ssh connections shouldn’t be interrupted on Debian or Ubuntu Linux? How do I regenerate new ssh server keys? How to regenerate new host keys on a Debian or Ubuntu Linux?[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 ![]()
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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.
Ssh Host Key CheckingSteps 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: Step 2 – Debian or Ubuntu Linux Regenerate OpenSSH Host Keys
Now create a new set of keys on your SSHD server, enter:
# dpkg-reconfigure openssh-server Sample output:
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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 files
Finally, you need to update ~/.ssh/known_hosts files on client computers, otherwise everyone will see an error message that read as follows:
Ssh Host Key Algorithm
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]
You can also pipe a collection ofobjects to Get-Random.Beginning in PowerShell 7, the InputObject parameter accepts arrays that can contain an emptystring or $null. Enter the objects, a variable that containsthe objects, or a command or expression that gets the objects. The array can be sent down the pipeline or as an InputObject parameter value. Powershell generate random aes key generator.
Conclusion
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
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