Re: IPS comparison

[Stefano Zanero <s.zanero () securenetwork it>]

Sanjay Rawat wrote:
> Hi Stefano:
> I got confused over one comment made by you: "First hint of the day: if
> there is a regexp there, it's NOT anomaly
> detection." why it is so? I can use association or frequent episode
> rules to capture normal behavior (you know this), and I can use regexp
> to represent such rules. 

Let me rephrase my comment then:

"If there is a GIVEN SET of regexp there, it's not anomaly detection"

If you create an induction algorithm for GENERATING a set of rules
describing normal behavior, you are creating an anomaly detection
system; if you instead give your customer a predefined set of rules to
match his traffic against, you cannot be far away from simple "protocol
anomaly detection" systems.

Best,
Stefano Zanero
---------------------------
Secure Network S.r.l.
www.securenetwork.it

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