Some new links about security

This article is an interesting example of how even someone with very little experience can still do some basic forensic.

http://blog.gnist.org/article.php?story=HollidayCracking

I added the link under the forensic section on the sys admin wiki

http://www.sysadmin.hep.ac.uk/wiki/Basic_Security#Forensic

Since I was at it I added a firewall section to

http://www.sysadmin.hep.ac.uk/wiki/Grid_Security#Firewall_configuration_and_Services_ports