Hope this helps...
http://www.cisco.com/c/en/us/td/docs/security/asa/asa72/asdm52/selected_procedures/asdmproc/asdmcer.html
http://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/71050-ASA-cert.html
http://www.cisco.com/c/en/us/td/docs/security/asa/asa80/configuration/guide/conf_gd/cert_cfg.html