[root@crackers /]# ssh-keygen  -t dsa -f /etc/ssh_host_dsa_key
Generating public/private dsa key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /etc/ssh_host_dsa_key.
Your public kkey has been saved in /etc/ssh_host_dsa_key.pub.
The key fingerprint is:
xx:xx:xx:....:xx root@crackers
[root@crackers /]# chmod 600 /etc/ssh_host_dsa_key
[root@crackers /]# chmod 644 /etc/ssh_host_dsa_key.pub

Mem: 6644K used, 153364K free, 0K shrd, 328K buff, 2756K cached
Load average: 0.05, 0.01, 0.00    (State: S=sleeping R=running, W=waiting)
PID USER     STATUS   RSS  PPID %CPU %MEM COMMAND
50 root     R        332    45  0.1  0.2 top
43 root     S       1192    33  0.0  0.7 /usr/sbin/sshd
45 root     S        920    43  0.0  0.5 -sh
33 root     S        880     1  0.0  0.5 /usr/sbin/sshd
1 root     S        336     0  0.0  0.2 init
40 root     S        292     1  0.0  0.1 /sbin/syslogd
41 root     S        276     1  0.0  0.1 /sbin/klogd
39 root     S        244     1  0.0  0.1 /sbin/getty
38 root     S        244     1  0.0  0.1 /sbin/getty
42 root     S        244     1  0.0  0.1 /usr/bin/tail
7 root     SW         0     1  0.0  0.0 [khubd]
8 root     SW         0     1  0.0  0.0 [kjournald]
5 root     SW         0     1  0.0  0.0 [bdflush]
6 root     SW         0     1  0.0  0.0 [kupdated]
2 root     SW         0     1  0.0  0.0 [keventd]
3 root     SWN        0     1  0.0  0.0 [ksoftirqd_CPU0]
4 root     SW         0     1  0.0  0.0 [kswapd]