ssh-keygen & ssh-copy-id

Fri, 25 Feb 2022 12:00:00 +0000

ssh-keygen allows generation of new key pair for authentication (SSH).

> ssh-keygen --help
unknown option -- -
usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa | rsa1]
 [-N new_passphrase] [-C comment] [-f output_keyfile]
 ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]
 ssh-keygen -i [-m key_format] [-f input_keyfile]
 ssh-keygen -e [-m key_format] [-f input_keyfile]
 ssh-keygen -y [-f input_keyfile]
 ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]
 ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]
 ssh-keygen -B [-f input_keyfile]
 ssh-keygen -D pkcs11
 ssh-keygen -F hostname [-f known_hosts_file] [-l]
 ssh-keygen -H [-f known_hosts_file]
 ssh-keygen -R hostname [-f known_hosts_file]
 ssh-keygen -r hostname [-f input_keyfile] [-g]
 ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]
 ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]
 [-j start_line] [-K checkpt] [-W generator]
 ssh-keygen -s ca_key -I certificate_identity [-h] [-n principals]
 [-O option] [-V validity_interval] [-z serial_number] file ...
 ssh-keygen -L [-f input_keyfile]
 ssh-keygen -A
 ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]
 file ...
 ssh-keygen -Q -f krl_file file ...

ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:KjqBCXEEFIBOOPDJ6j45tOBogwggxw3pAqECLG/r9fI root@mymachine.net
The key's randomart image is:
+---[RSA 2048]----+
|%* . |
|%==. |
|O*+o |
|*o* . |
|=* . S |
|*.o . . |
|Oooo... |
|=Oo.... |
|..=. oE |
+----[SHA256]-----+

SSH Keys

Ssh-Key-Gen on Samarthya

ssh-keygen & ssh-copy-id