Re: SCADA

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On Fri, Apr 24, 2009 at 6:10 PM, Daniel E. Hassler <[email protected]>
wrote:

> OK - I may have misrepresented what I'm doing. I am not doing true SCADA.
> I have a system which is required to report electric meter readings
> securely over the internet from remote sites. Traffic is allowed to pass
> (only
> encrypted) from the Modbus network (which has no control devices) to the
> public internet. The gateway is sufficiently secure given the value of
> the data. It's low value residential/small business stuff but it is not
> supposed to be visible to outside parties so it must travel encrypted.
> Authentication is also important as we need to know the data is from the
> meter is says it's from. If you've ever purchased anything over the
> internet you obviously felt the level of protection offered was
> sufficient. I would say these systems are as secure as OpenBSD which is
> actually not good enough to allow true SCADA access to the internet. No
> remote holes - ever or keep it away from the internet is a good mantra.
> Since I don't believe anyone has sufficiently proved they have a system
> with zero remote holes ever possible other than a system with zero remote
> connections I too would recommend strongly the
> latter for true SCADA where perhaps a power grid or nuclear plant are
> involved. Common sense.
>

Famous last words: "Sufficiently secure."

- - ferg

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-- 
"Fergie", a.k.a. Paul Ferguson
 Engineering Architecture for the Internet
 fergdawgster(at)gmail.com
 ferg's tech blog: http://fergdawg.blogspot.com/