In terms of complexity/size helping security, there may be additional categories:
 
1.  Anomaly detection might be part of a broader category of knowledge-based approaches that work better at large scale.  For instance, expert systems to detect credit card fraud or identity theft detection tend to work better as the amount of data increases.
 
2.  A more controversial improvement with scale comes from "data mining," however folks want to define that.  It's a long debate about when data mining works or is just marketing hype for putting more hay on the haystack.  But more data gives the possibility of more knowledge.
 
3.  The open source approach to security believes that having many eyes on a vulnerability increases the likelihood of detecting and then creating a patch for the vulnerability.  So security may improve when there are many eyes looking at vulnerabilities.  (This last point suggests that a Full Disclosure list, for instance, might improve security as the size of the system increases.)
 
Peter

Prof. Peter Swire
C. William O'Neill Professor of Law
Moritz College of Law of the
Ohio State University
Senior Fellow, Center for American Progress
(240) 994-4142, www.peterswire.net


-------- Original Message --------
Subject: Re: [Full-disclosure] emergent security properties
From: Roland Dobbins <[EMAIL PROTECTED]>
Date: Tue, December 26, 2006 8:32 pm
To: [email protected]

On Dec 26, 2006, at 4:19 PM, coderman wrote:

> the only example that comes to mind is distributed / collaborative
> anomaly detection systems which become more robust with a larger
> number of entities and interactions to observe.
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