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Re: Was Re: RAID 5 drive replacement schedule - Now "Availability"
From: "Mike Hale" <eyeronic.design () gmail com>
Date: Mon, 23 Jun 2008 08:27:19 -0700

"It does not mean that hardware reliability becomes a security issue."
You're absolutely right, and I think I simply didn't post that clearly
enough.  :)

"This means that regardless of our security implementations we have to
make the data available to users."
Well, yes and no.  That's where the CIA triad comes in.  A company
needs to decide which of the points to focus on.  It's a trade-off,
and you really can't do all three things perfectly.  Sometimes, the
confidentiality of your data is of paramount importance.  In that
case, you do want to pull the plug if necessary while accepting the
risk of making the data unavailable.

On 6/23/08, Nick Vaernhoej <nick.vaernhoej () capitalcardservices com> wrote:
Mike,

Based on my interpretation it seems to me like your interpretation will
make a customer attempting to access his online banking but fails
because the ISP has issues a security concern because his data isn't
available.

I think you say it best "It's about preventing unauthorized access and
change while maintaining it's useability to authorized users."

This means that regardless of our security implementations we have to
make the data available to users.
The availability criteria tries to make sure we do not unplug the server
in our efforts to avoid an incident.
It does not mean that hardware reliability becomes a security issue.

Nick Vaernhoej
"Quidquid latine dictum sit, altum sonatur."


-  -----Original Message-----
-  From: listbounce () securityfocus com
-  [mailto:listbounce () securityfocus com] On Behalf Of Mike Hale
-  Sent: Friday, June 20, 2008 4:10 PM
-  To: Mike Hale
-  Cc: Rivest, Philippe; Murda Mcloud; security-basics () securityfocus com
-  Subject: Re: Was Re: RAID 5 drive replacement schedule - Now
-  "Availability"
-
-  Availability is allowing your authorized users to access the data
when
-  they need to.
-
-  "that in its self is not _always_ a security concern, but it can be."
-  I disagree with you.  Availability is a fundamental portion of it
-  because without availability, that data is useless.  If you don't
have
-  access to it when you need it, I think your security system has
-  failed.
-
-  You're also correct that if a system crashes, data is no longer
-  available.  Sometimes, attacks on a network seek to do just that.
-
-  As far as the definition of security (especially in terms of data),
-  papers have been written trying to pin it down.  I think at it's most
-  basic, however, is CIA.  Confidentiality, Integrity and Availability.
-
-  It's about preventing unauthorized access and change while
maintaining
-  it's useability to authorized users.

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