Hi Beth --
Good question! I'm not really sure exactly how to find out about what systems are in use in federal government (I actually work in non-profit). I surfed over to the FBI's web page and looked under employment opportunities, but the job they had didn't specify any particular OS skills. Instead, it seemed to indicate that a broad knowledge of various IT solutions would be what they were interested in the most.
Of course, it's not really in the FBI's best interest to advertise what systems they have running in any sort of detail. That would be sort of like an advertisement saying, "Here's what we use. Find the exploits in these OSs and you can make us look really bad!" I imagine that emailing their IT folks is a good strategy.
If you're really interested in computer/network security, you might be interested in the Computer Informatino Systems Security Professinal (CISSP) certification. As I understand it, it's pretty much the holy grail of security certifications, and it's not easy to get. You can find details at
(Incidentally, I think that the cost for that exam was recently approved for coverage under the GI Bill.)
CISSP requires mastery of some 10 or so security domains. These are covered in a single 6-hour, 250 question multiple guess exam. There aren't all that many CISSP types floating around, so I imagine they're in pretty high demand.
Also, given your interest in forensic computing, I'd recommend getting your hands on just about anything on computer incident response such as :
[ul]
[li] Hacking Exposed (ISBN: 0072127481) by Joel Scambray, Stuart McClure, and George Kurtz[/li]
[li]Network Intrusion Detection (ISBN: 0735710082) by Stephen Northcutt, Donald McLachlan, and Judy Novak. [/li]
[/ul]
Just to be clear, I'm no expert in network security, but I've been favorably impressed by these books every time I've sat down to look at them in the library.
