Alerting Against Unlocked Doors

Author: Ethan Ace, Published on May 12, 2012

 

Unlocked doors are a key vulnerability of many access control systems. While a door may be closed, it can easily be kept unlocked, allowing an adversary to later enter without any authentication. Adding lock status monitoring can prevent this. In this note, we explain the risks, the solution, its cost and implementation.

Why ***** * **** **?

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What ** **?

****** ***, **** ******* ******** **** * **** ** ****** and ******. *********, ** ******-********** **** ******** * ******, * request-to-exit, * **** ********, *** * **** ** **** ****. The **** ******** ****** ***** *** ****** ******* *** **** is **** ** ******. ** ** **** **** *** ****** and *******-**-**** ****** ** **** ******* * **** *** **** forced **** ** ** * ***** **** **** ** *******-**-**** has ********. *******, ****** ******* ******* *** **** ** **** or ****** **** *** ******** ******* ** ** ****** ** unlocked, ** ******** ***** ** *** ****** ***** *****.

***** **** ********** ******** **** ****** ******** ***** **** ****, in ******** ** *** ***** *****.

****'* ** ***** ******* *** ******** ** *** ********** ****** inside * ****:

**** *** **** ** *******, *** ******* ******. **** ***, the ****** *** *** **** *** **** ** ******. ** monitor ********* ******, * *********** ******* ******* *** ********* *** fully ******** **** *** ****** ******. ******** **** ******* ******* whether *** ****** ***** *** ******** ******** *** ******* *** holding ********. ***** ******** *** *** ****, *******. ***** ****** expect ************* **-**% ***** **** *** ****, ** ~$**-$**.

** *** **** ** ***** ******* **** *******, ******** **** typically **** ** ** ********. **** ******* ************* ******* * bond ****** ******** *** *** ***** *****, *** *** ***. We **** ** ** ******** **** *** ******** *******.

How ** ** ****?

*** ******** *** ** *** **** ********** ** ** **** the ******** ** ****** **** *** **** ******** ******. ****, instead ** ****** ******* * **** ** **** ** ******, the ****** ***** *** ** ** **** *** *** ****** or ****** *** ******. **********, **** ********** ******* *** ** run ** ******** ****** *** **** ******** **********. ** *** wants ** ******* **** ****** **********, **** ****** *** **** be ****** ** ******* *********. ***** ******** ****** *** *** that ****** ** **** ******, *** ** ******* ***** ********** signals ****** ** ********* **********. ***** **** ********** ****** ********** systems ******* **** ****** ** * ****** *****, *** ***** software ******* ****, ** ******* **** ********** ** ********.

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