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Network Security CISSP-Discussion
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[CISSP-D] Confused: fail-safe and fail-secure lock

Subject: [CISSP-D] Confused: fail-safe and fail-secure lock
Date: Sat, 6 Nov 2004 23:04:23 -0800 (PST)

I am confused by the following definition about fail-safe and fail-secure lock:

CISSP All-in-One 2002 Page 330

A fail-safe configuration means that a door would default to being locked if 
there were any problem with the power.

A fail-soft setting means that if there were a power disruption,..., the doors 
would default to being unlocked.

The ASIS website provides the following definition:


fail  safe lock - a type of lock that automatically opens when a power failure 
occurs. 

fail secure lock - a type of lock that automatically locks when a power failure 
occurs, as opposed to a fail safe lock.

fail soft - the capability of a physical protection system to operate, perhaps 
in a reduced capacity, during a failure of some element in the system.
Can someone please advise me which definition should I follow?
 
Thanks.
 
--Weifeng
 

                        
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