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$ ssh-keygen -t rsa -b 4096 -f $HOME/.ssh/id_rsa_hlrnnhr
Generating public/private rsa key pair. 
Enter file in which to save the key (/home/user/.ssh/id_rsa_hlrnnhr):                 
Enter passphrase (empty for no passphrase): ************************
Enter same passphrase again: ************************
Your identification has been saved in /home/user/.ssh/id_rsa_hlrnnhr.
Your public key has been saved in /home/user/.ssh/id_rsa_hlrnnhr.pub.  
The key fingerprint is:  
b8:df:d1:14:48:03:00:68:5e:46:9c:1a:b2:b2:d4:f4 user@host  
The key's random art image is:   
+--[ RSA 4096]----+ 
|   +oo....o      |  
|. +.=    . o     | 
| =o=.     . .    |  
|o.o. E .     .   |  
|o.    . S   .    | 
|.      .   o     |  
|      .   . .    |  
|       . . .     | 
|        . .      | 
+-----------------+

In this example, the private key is saved in the file /home/user/.ssh/id_rsa_hlrnnhr, the corresponding public key in the file /home/user/.ssh/id_rsa_hlrnnhr.pub. If you run this command, user will be replaced by your local username.

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ssh-keygen -yf $HOME/.ssh/id_rsa_hlrnnhr
Enter passphrase:

If you are not asked for a passphrase, please use ssh-keygen =pf $HOME/.ssh/id_rsa_hlrnnhr to create a passphrase. Once you are certain that you have set a passphrase to protect the key, you can safely continue with uploading the public key as described below.

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• Select: Type of key to generate: SSH-2 RSA
• Fill in: Number of bits in a generated key: 4096
• Press: Generate
• Fill in: your key passphrase
• Fill in: confirm your passphrase
• copy the shown public key to a new textfile for upload to HLRNNHR
  (don't use "Save public key" for upload to HLRNNHR, wrong formatting here)
  
• Press: Save private key
• Please remember the path name where you saved your SSH key files!

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$ ssh -i $HOME/.ssh/id_rsa_hlrnnhr -l your_username blogin.hlrn.de
Enter passphrase for key '/<home_directory>/.ssh/id_rsa_hlrnnhr':
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Alternatively, use the SSH configuration file $HOME/.ssh/config on your local machine to permanently store options for specific SSH connections so that they can be omitted on the command line.

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Host blogin
    Hostname blogin.hlrn.de
    IdentityFile ~/.ssh/id_rsa_hlrnnhr
    User your_username

Now the ssh command will automatically choose the proper credentials in the future, i. e., -l your_username and -i <private_key> can be omitted from the command line so that ssh blogin  is sufficient.

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