Query: PhD research area

[secure knowledge <secureknowledge () yahoo com>]

Dear all,
 
I am intending to pursue my PhD in computer security. 
 
Has anyone got any experience in what it takes to do a PhD?
 
I need to refine an area of research. There are so many areas and i don't want to pick an area that may get solved 
while i do my PhD and hence render my work useless. This will always be an issues i guess!
 
anyone got any ideas on:
Intrustion Detection
Biometrics
Smart cards
Computer forensics
Malware
Privacy Management
Wireless
 
What about other areas?
 
regards
Secure.


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