SSH configuration on ASA 5500

Here is the configuration on how to enable SSH on ASA device.

ASA# config t
ASA(config)# enable password EPICPASSWORD
!--Enable password is necessary to enable ssh access

ASA(config)# username box password boxpasswordonly
!--Username and password for connecting using SSH

ASA(config)# aaa authentication ssh console LOCAL
!--We specified LOCAL authentication with usernamea & password above

ASA(config)# ssh 192.168.x.x 255.255.255.0 inside
!--This line allow the user with the right username and password
!--from this specific subnet (reside locally) to access the ASA
!--ssh (Outside IP) (Outside Subnet) outside
!--This is to allow user from the outside IP to access the ASA

ASA(config)# domain-name WOW.LOCAL
!--Domain name of your company.  RSA key is generated usig DOMAIN NAME
!--plus FIREWALL name combination

ASA(config)# crypto key generate rsa modulus 1024
!--ASA generate RSA key

The firewall is now ready for SSH connection.

Additional reading for ASA 8.3 configuration from Cisco site.