How to secure SSH/SSHD?

[DXMP]

Hi,

I heard that the most common way for a linux machine to be hacked is through SSH/SSHD. How can I secure my SSH using keys?

[dewlance]

(02-25-2011, 02:48 PM)DXMP Wrote:  Hi,

I heard that the most common way for a linux machine to be hacked is through SSH/SSHD. How can I secure my SSH using keys?

1. Change your default SSH Port

2. Generate a SSH keygen: http://linuxproblem.org/art_9.html

3. Disable Password authorization(Warning, First generate a keygen, If you can't connect to SSH then don't try to disable password authorization)

Code:

nano /etc/ssh/sshd_config

and change

Quote:#PermitRootLogin yes

to

Code:

PermitRootLogin no

Now, Restart sshd

Code:

/etc/init.d/sshd restart

4. You can also find some tutorials on google