$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/bob/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/bob/.ssh/id_rsa.
Your public key has been saved in /home/bob/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:LCWI8Wrw14m0Cxz1P+TqmL7Nn+mY19fWETCfjYK87VY bob@bob-ThinkPad-SL510
The key's randomart image is:
+---[RSA 2048]----+
|  . .   .        |
|   = o o     o   |
|. o + o +. .  +.o|
| + + + B .o . .+.|
|  * + = S  o .  .|
| . o = .  . . E. |
|    + .  . . o ..|
|   . o o.o. + o .|
|    o.=+=  o .   |
+----[SHA256]-----+
$